OPINION
PAGE, Justice.
On May 25, 2001, appellant Paul (NMN) Gutierrez, Jr., was indicted for causing the death of 18-month-old Makaio Lynn Rad-ke on April 20 or 21, 2001. The indictment charged Gutierrez with three counts: (1) first-degree murder while committing or attempting to commit criminal sexual conduct in the first or second degree in violation of Minn.Stat. § 609.185(2) (2002); (2) first-degree murder while committing child abuse in violation of Minn.Stat. § 609.185(5) (2002); and (3) second-degree felony murder while committing or attempting to commit assault in the first degree in violation of Minn.Stat. § 609.19, subd. 2(1) (2002). On March 4, 2002, a jury found Gutierrez guilty on all counts. He was sentenced on count one to life imprisonment without the possibility of release. We affirm.
We begin with a recitation of the facts underlying Gutierrez’s conviction. Peggy Radke (Radke) had three children: Ma-kaio and Alaeatra Radke from her marriage with Matthew Radke, and Dana Jacobs from a previous marriage. At the time of Makaio’s death, Radke was going through a divorce from Matthew Radke, who moved out of their house on January 11, 2001. Approximately one week later, Gutierrez and Kristina Baker1 moved into the Radke home. Although never formally agreed upon, Gutierrez and Baker took care of Radke’s children while Radke was at work in exchange for being allowed to live at the Radke home. Once Baker began working as well, Gutierrez became the primary caregiver for the children.
Soon after Gutierrez and Baker moved into the Radke home, Matthew Radke and various health care providers began noticing unusual bruising on Makaio.2 Makaio was seen by doctors on January 24, 2001, and again on February 1, 2001, for symptoms related to ear infections and bronchitis. No evidence of physical or sexual abuse was noted at the time of either visit [430]*430to the doctor. Chest x-rays taken at the time of the January 24 visit showed no signs of fractures to Makaio’s ribs. However, when Makaio was brought to the doctor’s office for a follow-up visit on February 28, 2001, his doctor noticed a half-inch bruise on each of Makaio’s cheeks. Although Radke stated that these bruises had been caused when Makaio fell while learning to walk, the doctor felt that this did not adequately account for the location, size, and shape of the bruises and a child abuse report was filed.
On March 2, 2001, a child protection worker made an unannounced visit to the Radke home. The worker noted a slight bruise on one of Makaio’s cheeks. Radke’s explanation for the bruise was that Makaio was learning to walk and frequently fell. Ultimately, the child protection worker concluded that the child abuse report could not be substantiated.
On March 21, 2001, Matthew Radke took Makaio to a police station to report an injury to Makaio’s left foot. The police photographed Makaio’s foot and head, and suggested that he be taken to urgent care for treatment. Examination at urgent care confirmed the foot injury and revealed, in addition, an injury on Makaio’s right hip, which appeared to have been caused by a blow from or a collision with a straight-edged object, several bruises on his face and chin, including a small bruise on the center of his forehead, and abrasions on his head, which were scabbed over. These injuries were reported to child protection and on March 26, 2001, the child protection worker made a second unannounced visit to Radke’s home. The child protection worker again concluded that the report of abuse could not be substantiated.
The next reported incident occurred on April 11, 2001, when Matthew Radke took Makaio to the police for the second time. This time it was to report bruises on Ma-kaio’s face, legs, and back, which according to Matthew Radke made Makaio look as though he had been beaten up. Matthew Radke told the police that three days earlier Makaio had had no bruising in those areas. The police again photographed and documented the bruising.
Two days later, on April 13, 2001, the children’s guardian ad litem visited the Radke home and observed two bruises on Makaio’s cheeks. Radke stated that Ma-kaio had slipped in the bathtub while she was bathing him.3 The guardian ad litem reported these injuries to the Department of Human Services and asked the police to investigate them, which they did that day. Pictures of Makaio’s injuries were taken by the same police officer who photographed Makaio on April 11, 2001. The officer testified that, while he did not see any injuries beyond those apparent on April 11, he noticed that the bruising on Makaio’s left cheek was more pronounced on April 13.
As a result of these incidents, a different child protection worker conducted an unannounced visit to the Radke home on the morning of April 20, 2001. At trial, this child protection worker testified that while she saw three healing bruises on Makaio’s body that morning, no other injuries were visible, and that during the time she spent at the Radke home Makaio did not show any hesitancy to be around his mother, although he seemed abnormally quiet and listless. She also testified that Alaeatra [431]*431appeared to be a normal, healthy child and that there was no evidence of any abusive behavior by Radke toward Alaeatra. Based on her observations, the social worker concluded that there was no evidence that Radke had intentionally injured Makaio.4
At approximately 1 p.m. that afternoon, Radke and Baker left for the day, leaving Makaio, Alaeatra, and Reanna in Gutierrez’s care. Dana was at school, after which she went to her father’s house for the evening. After they ran some errands, Baker took Radke to Baker’s parent’s house so that Radke could rest while Baker was at work. Baker returned to pick up Radke at 11:15 p.m. and the two arrived at the Radke home at approximately 1 a.m. on Saturday, April 21, 2001. When they arrived, Gutierrez and Reanna were asleep on the living room couch. At some point, having woken up, Gutierrez told Radke that the day had gone well except that he had spanked Alaeatra because she had fed the dog pizza and that Makaio had almost poked himself in the eye with a pencil. Baker and Gutierrez stayed up until about 2 a.m. before going to sleep. Radke stayed awake all night. Radke testified that the door to Makaio and Alaea-tra’s bedroom was closed when she got home and that she did not check on them because she assumed that they were in there.
When Alaeatra woke up the next morning, Radke fixed her breakfast. Gutierrez woke up at approximately 8 a.m. and peeked into Makaio and Alaeatra’s room before closing the door. Baker got up at around 8:30 a.m. At some point during the morning, Gutierrez called Radke into the bedroom to tell her about some bruises that Alaeatra had on her buttocks. He stated that he assumed that the bruising was caused by a spanking he gave Alaea-tra for feeding the dog pizza the night before. Because Matthew Radke was scheduled to pick up Alaeatra and Makaio later that afternoon, Radke called the children’s guardian ad litem to self-report the bruising. Radke told the guardian that Alaeatra had gotten the bruises from falling on a toy. That morning, Radke also noticed that Alaeatra was missing some hair from the top of her head. When she asked Gutierrez about it, he told her that Makaio had pulled Alaeatra’s hair out.
Around 9:50 a.m., Radke decided to wake Makaio. She had not checked on him during the morning because he had been suffering from a cold and thought it would be good to let him sleep late. While Radke was finishing a cigarette, Gutierrez went to wake Makaio. A few minutes later, Gutierrez yelled Radke’s name. Radke ran into Makaio’s room and saw Gutierrez standing over Makaio’s crib. Makaio was laying on his back, had bruises on his head, and was not moving. His arms were in the red sleeper he was wearing, but his legs were not, his skin was pale, and his lips were blue. Radke picked up Makaio’s body and ran into the firing room and began calling 911. Before she could complete the call, Gutierrez told her to take Makaio to the hospital, which Baker and Radke did. At the hospital, Makaio was pronounced dead at 10:19 a.m. from multiple traumatic injuries due to child abuse.
When Baker and Radke left for the hospital, Gutierrez called Kimberly Halstead to come to the house and watch Alaeatra and Reanna. He explained to Halstead that Makaio had been taken to the hospital because he was purple and not breathing. [432]*432He stated that he was worried that he might have played too rough with Makaio the night before, that he was scared to touch his own daughter, and indicated that he wanted to leave the house before the police arrived. In the meantime, Baker returned to the house, told Gutierrez that it did not look good, and that the police were probably right behind her. As Gutierrez went out the back door, the police came in the front door. Gutierrez went to a former girlfriend’s house, stayed there for about 15 minutes, then got a ride to another former girlfriend’s house, Valeri Carroll. According to Carroll, he told Carroll and her husband that a baby had died “on his watch.” He also told them that Makaio had fallen asleep in front of the television and that when he carried Makaio to bed, Makaio was wheezing and having trouble breathing.
At about 9 p.m. that evening, Gutierrez called Janice Vandervoort, his childhood foster mother. He told Vandervoort that he had wrestled with Makaio, that Makaio had fallen asleep on the floor about 9 p.m., and that he had put him to bed a half an hour later. He also told Vandervoort about finding Makaio cold and discolored that morning.
Gutierrez was arrested at Carroll’s house later that evening. Gutierrez was read his rights and agreed to talk to the police. Gutierrez told them that he was alone with the children all day on Friday, but denied killing Makaio. He told the police that in roughhousing with the kids he had tied Makaio’s legs up in his pajamas, had rolled him around on the couch and floor, and had thrown him up in the air.5 Gutierrez also described how Makaio fell asleep on the floor and how he was breathing a little funny. He indicated that after putting Makaio to bed he did not hear Makaio again. He noted that he was a light sleeper and would have heard Ma-kaio if he had cried during the night. Gutierrez told police that, “He died on my shift, while I was watching him.” Gutierrez also told police that Makaio had previously gotten a bruise when he was giving Makaio a bath and that Gutierrez had once accidentally given Makaio a carpet burn.
An autopsy was performed on Makaio’s body. The autopsy revealed that Makaio had died from exsanguination as a result of numerous soft tissue and internal injuries combined with an inability to breath due to blood accumulation in his left chest cavity. The autopsy report noted that the injuries would have been painful and as a result Makaio would have been crying, would have had labored breathing, and would likely have been wheezing. There were 75 bruises and abrasions on Makaio’s body, including bruises on the shaft of his penis and the anterior surface of the right scrotal sack, abrasions on the perineum, and a periorbital hematoma around his left eye. There were also two lacerations of note: a V-shaped anal laceration extending into the anal cavity and a laceration on the inside of his mouth. The bruises were described as having a somewhat circular and oval configuration and appeared to match the size and shape of the head of a black plastic rod found in the Radke home and were consistent with Makaio having been struck multiple times.6 According to the report, with the exception of two or three of the bruises, all of the external [433]*433injuries were fresh. In addition to the external injuries, there were: (1) fractures to Makaio’s ribs, numbers four through nine on the left side, and two and three on the right side; (2) scattered areas of hemorrhaging inside the scalp covering multiple surfaces on the sides, front, back, and top; (3) bruises to and a laceration of the lung; and (4) trauma and damage to the spleen, diaphragm, and liver.
At trial, the medical examiner who performed the autopsy testified that, based on the condition of the body, Makaio died a full 10 to 12 hours before he was pronounced dead at the hospital and that he most likely died between 10 p.m. and midnight on Friday, April 20. The medical examiner further testified that death would have occurred anywhere from several minutes up to just over an hour after the injuries were inflicted and acknowledged that it was possible that Makaio did not die until sometime after 1 a.m. The pathologist who testified on behalf of Gutierrez indicated that he could not rule out the possibility that Makaio’s injuries were inflicted after 1 a.m., although it was most likely that the injuries and death occurred before 1 a.m.
DNA testing conducted on a crusty white spot found on Makaio’s red sleeper revealed the presence of sperm and semen. The testing detected the presence of DNA from two or more individuals. The DNA profile of the primary contributor matched Makaio’s, and Gutierrez could not be eliminated as the other contributor. At trial, the prosecution elicited testimony that, because of his young age, Makaio could not produce semen, and therefore the semen found on the sleeper had to come from someone else.
Gutierrez raises seven issues on appeal: (1) whether the trial court committed plain error in its jury instruction on the elements of first-degree murder while committing or attempting to commit criminal sexual conduct; (2) whether the trial court properly admitted evidence of PCR-STR DNA testing;7 (3) whether the trial court properly admitted evidence of Gutierrez’s relationship with Alaeatra; (4) whether the trial court properly admitted evidence of Gutierrez’s preference for anal sex; (5) whether the trial court properly excluded third-party perpetrator evidence; (6) whether Gutierrez’s mandatory sentence of life imprisonment without possibility of release violates Article I, Section 5, of the Minnesota Constitution; and (7) whether there was sufficient evidence to support the child abuse murder conviction. We affirm.
I.
Initially, we address whether the trial court committed plain error in its unobjected-to jury instructions on first-degree murder. In general, when a defendant fails to object to instructions before they are given to the jury, the right to appeal is waived. State v. Cross, 577 N.W.2d 721, 726 (Minn.1998). However, this court may grant relief when the defendant fails to object to an error that constitutes plain error affecting substantial rights or is one of fundamental law. Id. In order to constitute plain error: (1) there must be error; (2) which is plain; and (3) which affects the defendant’s substantial rights. State v. Crowsbreast, 629 N.W.2d 433, 437 (Minn.2001). Each prong of the plain error test must be met before we will correct the error, and then, only if the [434]*434error “ ‘seriously affect[s] the fairness, integrity, or public reputation of judicial proceedings.’ ” Id. (quoting Johnson v. United States, 520 U.S. 461, 467, 117 S.Ct. 1544, 137 L.Ed.2d 718 (1997) (internal citations omitted)). Trial courts are permitted considerable freedom when determining how to instruct the jury as long as the jury instruction is not confusing or misleading on fundamental points of the law. State v. Ihle, 640 N.W.2d 910, 916 (Minn.2002); see Cross, 577 N.W.2d at 726 (finding that on appeal jury instructions are to be read in their entirety, and if the reviewing court determines that the instructions “correctly state[s] the law in language that can be understood by the jury there is no reversible error”).
Gutierrez was charged with murder in the first degree under Minn.Stat. § 609.185(2) (2002), which provides that anyone who “causes the death of a human being while committing or attempting to commit criminal sexual conduct in the first or second degree with force or violence, either upon or affecting the person or another,” is guilty of murder in the first degree and shall be sentenced to imprisonment for life. He claims that the trial court committed plain error when it instructed the jury on the elements the state was required .to prove to convict him under section 609.185(2). Specifically, he contends that the trial court failed to give any instruction with respect to the statute’s requirement that the force or violence involved in committing or attempting to commit criminal sexual conduct in the first or second degree be “either upon or affecting the person or another” and that the instruction given with respect to “force or violence” was-erroneous.
Our review of the trial court’s instruction satisfies us that the instruction given with respect to committing criminal sexual conduct with “force or violence, either upon or affecting the person,” was not confusing or misleading and did not materially misstate the law and therefore no error, much less plain error, occurred. The trial court instructed the jury as follows:
Fourth, the defendant acted with force or violence. A person acts with force or violence if a person intentionally inflicts or attempts to inflict bodily harm upon another person or intentionally causes fear in the other person of immediate bodily harm or death. Bodily harm means physical pain or injury, illness or any impairment of physical condition.
This instruction, as given, belies Gutierrez’s claim that the trial court did not instruct the jury on the statutory requirement that the force or violence be “either upon or affecting the person or another.” While the trial court did not use the specific statutory language, it is clear from the instruction that the force or violence used by the defendant had to be upon another person. Based on the considerable freedom we give to trial courts when instructing juries, we are satisfied that the instruction given adequately informed the jury with respect to the claimed error. Therefore, Gutierrez’s claim fails.
Gutierrez’s argument that the inclusion of the language “intentionally causes fear * * * of immediate bodily harm” in this instruction was plain error is also unavailing because he fails to show that this error affected substantial rights, the third prong of the plain error test. Generally, an ■ error affects substantial rights when “the defendant can prove that the error was prejudicial and affected the outcome of the case.” State v. Rhodes; 657 N.W.2d 823, 839 n. 7 (Minn.2003). In the context of jury instructions, we have held that an error affects substantial rights when there is a “reasonable likelihood that a more accurate instruction would have [435]*435changed the outcome in this case.” Ihle, 640 N.W.2d at 917. Here, Gutierrez cannot prove that there is a reasonable likelihood that a more accurate instruction would have changed the outcome of the case. While the trial court’s instruction included the words “intentionally causes fear in the other person of immediate bodily harm,” the record establishes that the state never argued, presented evidence, insinuated, or suggested that this was the basis for their case against Gutierrez. Indeed, the state’s entire case was based on the extensive injuries that were inflicted on Makaio before his death. The evidence in the record establishes that Makaio suffered: (1) 75 soft-tissue injuries; (2) fractures to eight of his ribs; (3) scattered areas of hemorrhaging inside his scalp covering multiple surfaces on the sides, front, back, and top; (4) bruises to and a laceration of his lung; and (5) trauma and damage to his spleen, diaphragm, and liver. Based on this record, even if this language had been excluded, there is little, if any, possibility that the jury would have reached a different result. Thus, we cannot conclude that the instruction as given was prejudicial and affected Gutierrez’s substantial rights.
II.
We next address Gutierrez’s contention that the trial court erred when it ruled that the evidence of his alleged physical abuse of Alaeatra was non-Spreigl relationship evidence. At trial, the evidence Gutierrez now complains about was found to be admissible on two grounds: (1) under Minn.Stat. § 634.20, as evidence of similar conduct by the accused against other family or household members; and as (2) non-Spreigl relationship evidence. Gutierrez does not challenge the admissibility of the evidence under section 634.20 and our review of the record satisfies us that the evidence was properly admitted under that section. Because we conclude that the evidence was properly admitted on alternative grounds, we need not address Gutierrez’s claim that it was erroneously admitted as non-Spreigl relationship evidence.
III.
Gutierrez also contends that the trial court erred in admitting testimony regarding his preference for anal sex based on its determination that “the door was opened” by his attorney’s questioning of Baker about his sexual preferences. Specifically, he argues that the prosecution’s subsequent questions regarding anal sex were outside the scope of issues raised during the cross-examination of Baker and therefore the rebuttal evidence elicited by the prosecution was improper.
In general, rebuttal evidence is evidence that explains, contradicts, or refutes evidence elicited by the defense. State v. Swanson, 498 N.W.2d 435, 440 (Minn.1993). The determination of whether or not something is appropriate rebuttal evidence rests within the discretion of the trial court and will only be reversed upon a showing of a clear abuse of discretion. Id.; see State v. Kennedy, 585 N.W.2d 385, 389 (Minn.1998). Proper rebuttal evidence may include evidence that might not otherwise be admissible. 8 Henry McCarr & Jack Nordby, Minnesota Practice-Crim. Law and Proc. § 32.54 (3d ed.2001) (defining the concept of “opening the door” as circumstances under which the introduction of certain material, either in the form of evidence, argument, or as a question or remark, by one party creates a right to respond with material that would otherwise be inadmissible).
Here, the defense elicited testimony from Baker regarding Gutierrez’s lack of sexual attraction to children, whether she [436]*436had ever seen him sexually abuse a child, and whether Gutierrez had ever raped her or Radke. The defense also questioned Baker regarding her awareness of Ma-kaio’s anal injury, whether she personally saw the injury, and whether or not anyone in the house had any vibrators. Given the nature and scope of these questions as asked by defense counsel, particularly the questions related to Makaio’s anal injury, we conclude that the trial court did not abuse its discretion when it allowed the prosecution to inquire into Gutierrez’s preference for anal sex.
IV.
Gutierrez next asks us to determine whether the trial court erred when it refused to allow third-party perpetrator evidence that Radke was responsible for Makaio’s death. Gutierrez contends that Radke had the opportunity to cause Ma-kaio’s death and alleges that he should have been able to introduce evidence that Radke abused and neglected her children and that Makaio suffered from “failure to thrive” as a result of this treatment. He argues that it was his constitutional right to present this evidence and maintains that the trial court used the wrong standard to determine whether the third-party evidence was admissible.' Based on the other evidence presented at trial, the trial court found that evidence of Radke being present in the home at the time Makaio was injured was not established by clear and convincing evidence.
As noted above, evidentiary rulings are within the discretion of the trial court and will only be reversed when that discretion is abused. State v. Johnson, 568 N.W.2d 426, 432 (Minn.1997). Under Rule 404(b) of the Minnesota Rules of Evidence, a criminal defendant may seek to introduce evidence of other crimes or bad acts of a third person that would tend to prove that the third person committed the crime for which the defendant is on trial. Johnson, 568 N.W.2d at 433; see State v. Hawkins, 260 N.W.2d 150, 158-59 (Minn.1977) (concluding that the purpose of such evidence is “not to prove the guilt of the [third person], but to generate a reasonable doubt of the guilt of the defendant”). Before evidence of a third party’s bad acts, often referred to as reverse-Spreigl evidence, may be admitted, the defendant must first lay a foundation consisting of additional evidence which has “ ‘an inherent tendency to connect such other person with the actual commission of the crime.’ ” Hawkins, 260 N.W.2d at 159 (internal citations omitted). If such a foundation is not laid, the proffered reverse-Spreigl evidence is inadmissible and the trial court need not consider it further. Id. (noting that this requirement “avoids the use of bare suspicion and safeguards the third person from indiscriminate use of past differences with the deceased”).8
[437]*437If the defendant presents evidence having an inherent tendency to connect the alleged third-party perpetrator to the charged offense, the defendant may go forward with evidence showing “crimes of a similar nature have been committed by [the third person] when the acts of such other person are so closely connected in point of time and method of operation as to cast doubt upon the identification of defendant as the person who committed the [charged offense].” See State v. Bock, 229 Minn. 449, 458, 39 N.W.2d 887, 892 (1949), quoted in Johnson, 568 N.W.2d at 433 (defining revers e-Spreigl evidence). Before reverse-Spreigl evidence may be admitted, the defendant must establish: “(1) by clear and convincing evidence that the third party participated in the reverse-Spreigl evidence; (2) that the reverse-Spreigl incident is relevant and material to [the] defendant’s case; and (3) that the probative value of the revers e-Spreigl evidence outweighs its potential for unfair prejudice.” See Johnson, 568 N.W.2d at 433-34. Failure to satisfy any part of this test results in the evidence being inadmissible. Thus, third-party perpetrator evidence may only be admitted when both a proper foundation has been laid and each part of the revers e-Spreigl test has been met.
In this case, the trial court found that Gutierrez failed to prove by clear and convincing evidence that Radke was present in her home at the time Makaio was injured. It appears from this finding that the trial court may have blended the requirements for laying a proper foundation for the admission of third-party perpetrator evidence with the requirement for the admission of revers e-Spreigl evidence.9 Notwithstanding the fact that the trial court may have blended the two standards, we conclude that the trial court did not abuse its discretion in finding the proffered revers e-Spreigl evidence inadmissible.
Whether Gutierrez laid a proper foundation for the consideration of the reverse-Spreigl evidence is a close question. The forensic experts for the state and Gutierrez testified that while it was possible Makaio’s death occurred after Radke returned to the home at 1 a.m. on the morning of April 21, 2001, it was more likely that he died between 10 p.m. and midnight the night before. The forensic evidence raises the following question: Does the fact that Radke was present in the home at a time when it was possible, but unlikely, that Makaio died have an inherent tendency, to connect Radke to the commission of Makaio’s murder? On the facts presented, we tend to think that it does not. We need not answer that question definitively, however, because even if we were to conclude that a proper foundation had been laid the record satisfies us that the third-party perpetrator evidence Gutierrez sought to admit fails the reverse-Spreigl test.
Gutierrez sought to admit evidence relating to a number of incidents that occurred in 1993 and 1994 between Radke and Dana Jacob’s father, a number of incidents between Radke and Matthew Radke, and a number of incidents of alleged abuse and neglect of her children. However, our review of this evidence leads us to conclude that it has limited probative value and serves no purpose other than to attempt to persuade the jury that Radke was in some way responsible for Makaio’s [438]*438death merely because she was not an ideal mother. Because we conclude that this evidence is more prejudicial than probative, it fails the third part of the reverse-Spreigl test and was properly excluded by the trial court.
Gutierrez also sought to admit evidence relating to a cigarette burn Alaeatra allegedly suffered on February 1, 1999, which he claims was Radke’s fault. Beyond Gutierrez’s allegation that Radke was responsible for the cigarette burn, the record before us is devoid of any evidence as to who was to blame for the cigarette burn. Mere allegations without additional proof cannot satisfy the clear and convincing requirement of the reverse-Spreigl test. Therefore, this evidence was properly excluded.
Because the excluded third-party perpetrator evidence complained of was inadmissible under the revers e-Spreigl test, we conclude that any error resulting from the trial court’s determination was not an abuse of discretion.
V.
We are also asked to determine whether Gutierrez’s sentence is so excessive and disproportionate to the crime that it constitutes cruel or unusual punishment in violation of Article I, Section 5, of the Minnesota Constitution. Gutierrez was sentenced under Minn.Stat. § 609.106, subd. 2(1) (2002), which provides for a mandatory life sentence without the possibility of release for anyone convicted of first-degree murder while committing or attempting to commit criminal sexual conduct in violation of Minn.Stat. § 609.185(2) (2002).
When a defendant asserts that a life sentence without the possibility of release violates the prohibition against cruel or unusual punishment, this court reviews the constitutional challenge de novo. See State v. Chambers, 589 N.W.2d 466, 479 (Minn.1999). The Minnesota Constitution provides that no person may be subject to “cruel or unusual punishment.” Minn. Const, art. I, § 5; see also U.S. Const. Amend. VIII (prohibiting “cruel and unusual punishment”); State v. Mitchell, 577 N.W.2d 481, 488 (Minn.1998) (recognizing the Minnesota Constitution provides a defendant with greater protection than the U.S. Constitution). In general, to determine whether a sentence is unconstitutional, the court focuses on whether the punishment is proportional to the crime. Mitchell, 577 N.W.2d at 489. Because statutes are presumed constitutional, the defendant bears a heavy burden and is required to show that “ ‘our culture and laws emphatically and well nigh universally reject’” the sentence the defendant is claiming is cruel or unusual. Chambers, 589 N.W.2d at 479-80 (quoting Harris v. Wright, 93 F.3d 581, 583 (9th Cir.1996)).
Minnesota has a long tradition of classifying murder while committing criminal sexual conduct in the first or second degree as first-degree murder. See Minn. Stat. § 609.185(2) (1963). Since 1989, this crime has been classified as a “heinous crime,” which is punishable by the imposition of a mandatory life sentence without the possibility of release. See Minn.Stat. § 609.184 (1989), recodified at Minn. Stat § 609.106 (1998). While making a number of arguments in support of his challenge to his sentence, Gutierrez offers no factual support that would allow this court to conclude that “our culture and laws emphatically and well nigh universally reject” incarceration for life without the possibility of release as a legislatively mandated sentence for murders committed during the commission of criminal sexual conduct in the first or second degree. Therefore, we affirm his sentence.
[439]*439VI.
Finally, Gutierrez challenges the sufficiency of the evidence supporting the jury’s verdict finding him guilty of first-degree murder based on a past pattern of child abuse. Because we affirm Gutierrez’s conviction and sentence for first-degree murder while committing or attempting to commit criminal sexual conduct in the first or second degree, we need not address this issue.
Affirmed.