OPINION
LEE GABRIEL, JUSTICE
[371] Appellant M.K.1 is now fifty-nine years old. The State alleges that on August 7, 1973—when Appellant was fifteen years old—he murdered fourteen-year-old D.R. The State previously filed a delinquent-child petition in juvenile court against Appellant in 1978 alleging that he murdered D.R., but the juvenile court ultimately dismissed the case at the State’s request because of insufficient evidence. According to the State, the ease went cold until 2015, when investigators discovered previously unknown evidence implicating Appellant in D.R.’s murder. The State now seeks to prosecute him for that offense.
Because Appellant was fifteen years old at the time of the alleged offense and is now well over eighteen years of age, the State filed a petition in the juvenile court pursuant to section 54.02(j) of the Texas Family Code asking it to waive its jurisdiction over this case and to transfer Appellant to the criminal district court. See Tex. Fam. Code Ann. § 54.02(j) (West 2014). After holding an evidentiary hearing, the juvenile court signed an amended order waiving jurisdiction and transferring Appellant to the criminal district court.2 Appellant appeals from that amended waiver and transfer order. Because we conclude that the juvenile court’s amended waiver and transfer order is void, we vacate that order and dismiss this appeal.
I. BACKGROUND
A. The Initial Murder Investigation
D.R.’s homicide remained a cold ease from the time the delinquent-child petition against Appellant was dismissed on January 22, 1974 until early 2015, when a brother of D.R. contacted a detective in the Cold Case Unit at the Fort Worth Police Department (FWPD) to inquire about it. That detective gathered some of the original paperwork related to the case. In May 2015, D.R.’s brother again contacted the FWPD Cold Case Unit, this time speaking to Detective Michael McCor-mack. After receiving the phone call from D.R,’s brother, Detective McCormack reviewed the case file and learned the following information. At some point on August 7,1973, Appellant’s parents and sisters left their house to go visit family. As they were leaving, Appellant’s parents saw him playing basketball with D.R. in the driveway. When Appellant’s family returned to the house later that day, they discovered that a large rock had been thrown through the sliding glass door leading to their back patio. One of Appellant’s sisters went into a hallway bathroom and discovered D.R. dead on the floor. He had been shot in the face with a shotgun and stabbed multiple times with a kitchen knife, which had been left in his chest.
D.R.’s injuries were so severe that Appellant’s mother, R.K., initially believed Appellant was the deceased victim, but she learned that was not the case after Appellant’s uncle, E.M., called her and told her that Appellant was with him at his house, which was a couple of miles away. E.M. stated that Appellant had run to his house and told him that somebody had broken into his house and that his friend was dead. E.M. also called the police and then drove Appellant back to his house. By the time E.M. arrived back at the crime scene with Appellant, FWPD investigators were [372] already on site, and an Officer Earl Ferguson spoke with Appellant. Appellant told Officer Ferguson that he and D.R. were playing basketball when D.R. asked Appellant to use the bathroom. Appellant stated that he escorted D.R. inside the house to the bathroom and then went back outside to continue playing basketball by himself. He said that he continued to play basketball by himself for a few minutes when he heard the sound of glass breaking coming from the back of his house. Appellant said he went to the back of the house, heard a gunshot, and then fled to his uncle’s house.
Inside the house, officers discovered wadding belonging to a 16-guage shotgun shell in the bathroom where D.R. was killed.3 They also found a 16-guage shotgun in the master bedroom closet, which smelled like it had been recently fired. Investigators recovered the knife from D.R.’s chest, and R.K. confirmed that it was one of the knives from her kitchen. Officers further discovered that a large floor model console television had been turned over in front of the back patio door. Some of the broken glass from the back patio door was on top of the overturned television, but when officers picked up the television, there was no glass underneath it, suggesting that it had been overturned before the sliding glass door was broken.
Investigators interviewed a few individuals in the neighborhood. They interviewed two boys, R.H. and M.P., who were about the same age as Appellant. They told officers that the day before D.R. was killed, they were both at Appellant’s house playing basketball with Appellant and that Appellant asked them separately to come inside his house. R.H. stated that when he walked into the house, Appellant pointed a shotgun at him, pulled the trigger, and said, “Talk noise now.” M.P. stated that when he went in the house separately, Appellant pointed a shotgun at him and then later showed him another shotgun in a bedroom. Officers also interviewed fourteen- or fifteen-year-old C.G., who lived in a house about 400 yards behind Appellant’s. C.G. stated that on the day of the homicide, he was outside in his yard when he heard a crash. He looked in the direction of the sound, which was the back of Appellant’s house, and he saw a young black male walking away from the sliding glass door. Another neighbor told officers that her dogs were in her backyard and that they barked at everything. But her dogs did not bark until officers arrived at Appellant’s house.
B. The Initial Delinquent-Child Petition
In reviewing the case file, Detective McCormack further learned that the State filed a delinquent-child petition against Appellant in juvenile court on August 24, 1973, alleging that he had murdered D.R. with a shotgun. The State amended its petition twice, filing its third and final amended petition on January 7, 1974, in which it alleged Appellant (1) had murdered D.R. on August 7, 1973 “by shooting him with a gun and stabbing and cutting him with a knife”; (2) had committed aggravated assault with a deadly weapon against R.H. on August 6, 1973; and (3) had committed aggravated assault with a deadly weapon against M.P. on August 6, 1973.
C. Dismissal of the Initial Delinquent-Child Petition
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OPINION
LEE GABRIEL, JUSTICE
[371] Appellant M.K.1 is now fifty-nine years old. The State alleges that on August 7, 1973—when Appellant was fifteen years old—he murdered fourteen-year-old D.R. The State previously filed a delinquent-child petition in juvenile court against Appellant in 1978 alleging that he murdered D.R., but the juvenile court ultimately dismissed the case at the State’s request because of insufficient evidence. According to the State, the ease went cold until 2015, when investigators discovered previously unknown evidence implicating Appellant in D.R.’s murder. The State now seeks to prosecute him for that offense.
Because Appellant was fifteen years old at the time of the alleged offense and is now well over eighteen years of age, the State filed a petition in the juvenile court pursuant to section 54.02(j) of the Texas Family Code asking it to waive its jurisdiction over this case and to transfer Appellant to the criminal district court. See Tex. Fam. Code Ann. § 54.02(j) (West 2014). After holding an evidentiary hearing, the juvenile court signed an amended order waiving jurisdiction and transferring Appellant to the criminal district court.2 Appellant appeals from that amended waiver and transfer order. Because we conclude that the juvenile court’s amended waiver and transfer order is void, we vacate that order and dismiss this appeal.
I. BACKGROUND
A. The Initial Murder Investigation
D.R.’s homicide remained a cold ease from the time the delinquent-child petition against Appellant was dismissed on January 22, 1974 until early 2015, when a brother of D.R. contacted a detective in the Cold Case Unit at the Fort Worth Police Department (FWPD) to inquire about it. That detective gathered some of the original paperwork related to the case. In May 2015, D.R.’s brother again contacted the FWPD Cold Case Unit, this time speaking to Detective Michael McCor-mack. After receiving the phone call from D.R,’s brother, Detective McCormack reviewed the case file and learned the following information. At some point on August 7,1973, Appellant’s parents and sisters left their house to go visit family. As they were leaving, Appellant’s parents saw him playing basketball with D.R. in the driveway. When Appellant’s family returned to the house later that day, they discovered that a large rock had been thrown through the sliding glass door leading to their back patio. One of Appellant’s sisters went into a hallway bathroom and discovered D.R. dead on the floor. He had been shot in the face with a shotgun and stabbed multiple times with a kitchen knife, which had been left in his chest.
D.R.’s injuries were so severe that Appellant’s mother, R.K., initially believed Appellant was the deceased victim, but she learned that was not the case after Appellant’s uncle, E.M., called her and told her that Appellant was with him at his house, which was a couple of miles away. E.M. stated that Appellant had run to his house and told him that somebody had broken into his house and that his friend was dead. E.M. also called the police and then drove Appellant back to his house. By the time E.M. arrived back at the crime scene with Appellant, FWPD investigators were [372] already on site, and an Officer Earl Ferguson spoke with Appellant. Appellant told Officer Ferguson that he and D.R. were playing basketball when D.R. asked Appellant to use the bathroom. Appellant stated that he escorted D.R. inside the house to the bathroom and then went back outside to continue playing basketball by himself. He said that he continued to play basketball by himself for a few minutes when he heard the sound of glass breaking coming from the back of his house. Appellant said he went to the back of the house, heard a gunshot, and then fled to his uncle’s house.
Inside the house, officers discovered wadding belonging to a 16-guage shotgun shell in the bathroom where D.R. was killed.3 They also found a 16-guage shotgun in the master bedroom closet, which smelled like it had been recently fired. Investigators recovered the knife from D.R.’s chest, and R.K. confirmed that it was one of the knives from her kitchen. Officers further discovered that a large floor model console television had been turned over in front of the back patio door. Some of the broken glass from the back patio door was on top of the overturned television, but when officers picked up the television, there was no glass underneath it, suggesting that it had been overturned before the sliding glass door was broken.
Investigators interviewed a few individuals in the neighborhood. They interviewed two boys, R.H. and M.P., who were about the same age as Appellant. They told officers that the day before D.R. was killed, they were both at Appellant’s house playing basketball with Appellant and that Appellant asked them separately to come inside his house. R.H. stated that when he walked into the house, Appellant pointed a shotgun at him, pulled the trigger, and said, “Talk noise now.” M.P. stated that when he went in the house separately, Appellant pointed a shotgun at him and then later showed him another shotgun in a bedroom. Officers also interviewed fourteen- or fifteen-year-old C.G., who lived in a house about 400 yards behind Appellant’s. C.G. stated that on the day of the homicide, he was outside in his yard when he heard a crash. He looked in the direction of the sound, which was the back of Appellant’s house, and he saw a young black male walking away from the sliding glass door. Another neighbor told officers that her dogs were in her backyard and that they barked at everything. But her dogs did not bark until officers arrived at Appellant’s house.
B. The Initial Delinquent-Child Petition
In reviewing the case file, Detective McCormack further learned that the State filed a delinquent-child petition against Appellant in juvenile court on August 24, 1973, alleging that he had murdered D.R. with a shotgun. The State amended its petition twice, filing its third and final amended petition on January 7, 1974, in which it alleged Appellant (1) had murdered D.R. on August 7, 1973 “by shooting him with a gun and stabbing and cutting him with a knife”; (2) had committed aggravated assault with a deadly weapon against R.H. on August 6, 1973; and (3) had committed aggravated assault with a deadly weapon against M.P. on August 6, 1973.
C. Dismissal of the Initial Delinquent-Child Petition
Detective McCormack discovered that on January 22, 1974, the State moved to [373] dismiss the case it filed against Appellant because “the evidence was insufficient.” Upon learning that the case had been dismissed against Appellant, Detective McCormack contacted Riley Shaw, an Assistant District Attorney with the Tarrant County District Attorney’s office, on June 29, 2015 to find out what he would need to do in order to move forward on the case. Shaw told McCormack that he would try to find his office’s original notes on the case to see if there was any other information as to why the case against Appellant had been dismissed. On July 23, 2015, Detective McCormack met with Shaw to discuss the case.4 Shaw informed McCormack that he had been unable to locate any notes regarding why the case had been dismissed, but he noticed that the motion to dismiss had been filed by then Assistant District Attorney Billy Mills,5 so Shaw and Detective McCormack called Mills to ask him about the case. When Detective McCormack and Shaw spoke "with Judge Mills, he stated that he remembered the case involving Appellant. He elaborated that the case had been dismissed for insufficient evidence because although he believed Appellant was responsible for D.R.’s death, he did not believe he could disprove Appellant’s story that a home intruder had murdered D.R. Shaw then told Detective McCormack that the case could be reopened to see if he could uncover any new evidence.
D. The Re-Opened Investigation
Detective McCormack contacted Officer David Whisenhunt, who was one of the officers who originally investigated the crime scene after D.R.’s murder. Officer Whisenhunt stated that he remembered the case and that he believed the crime scene had been staged. Detective McCor-mack then brought Appellant to his office for an interview. Appellant stated that D.R. went into the house alone and that he continued to play basketball outside until he heard glass breaking in the back of the house.6 Appellant said he went to the back of the house, saw broken glass on the patio, and heard a gunshot. Unlike his previous account, however, Appellant stated that he then saw a white male intruder inside the house and that the intruder pointed a shotgun at him. When the intruder pointed the gun at him, Appellant stated he fled to E.M.’s house. When Detective McCormack asked Appellant about whether he had pointed a shotgun at R.H. or M.P. the day before D.R. was murdered, Appellant denied that he had ever done that.
Detective McCormack interviewed E.M., who stated that he remembered the events and that when Appellant ran to his house, Appellant never told him that he had actually seen an intruder. Detective McCor-mack contacted R.H., who confirmed that the day before D.R. was murdered, Appellant had pointed a shotgun at him and that Appellant stated he had received the shot[374] gun as a birthday present. R.H. also confirmed that M.P. had come out of Appellant’s house and stated that Appellant had pointed a shotgun at him.
Detective McCormack also spoke with Appellant’s mother, R.K., who still resided at the house where D.R. had been killed. She relayed much of the same information that Detective McCormack had learned when reading over the original case file. However, she provided Detective McCor-mack with some additional information. She stated that after the police left her house, E.M. told her that he believed Appellant had shot D.R. She also stated that after the police left, Appellant told her that D.R. had gone into the house to use the restroom. Appellant stated that D.R. had been in the restroom for a while, so Appellant went in the house to check on him. Appellant said he found D.R. in the restroom playing with a toy that belonged to Appellant’s brother and that he told D.R. to drop the toy. Appellant said when D.R. did not drop the toy, he went to the master bedroom closet, grabbed a shotgun, returned to the bathroom, pointed the shotgun at D.R., and again told him to drop the toy. Appellant told R.K. that D.R. still did not drop the toy, so he shot him. Appellant told R.K. that although he did not remember anything after he shot D.R., he must have also stabbed him. R.K. also told Detective McCormack that Appellant is the one who broke the sliding glass door. R.K. told Detective McCormack that she chose not to disclose to police the information Appellant told her because the police had already left and because one of the police officers was mean and believed Appellant had shot D.R. on purpose.
Based on the new information R.K. had provided, the FWPD arrested Appellant for murder. He was transported to the FWPD homicide office, where Detective McCormack informed him that he was under arrest for murder and read him his Miranda warnings. Detective McCormack informed Appellant that he had spoken to R.K. and asked Appellant if he wanted to hear what she told him, and Appellant said that he did. Detective McCormack played the portion of the taped interview with R.K. in which she stated that Appellant told her that he shot D.R., and Appellant stated that he did not want to hear any more of the taped interview. Appellant then told Detective McCormack that he did not mean to kill D.R. He stated that he and D.R. were in the house playing with guns, which was his idea. He stated that D.R. pointed a gun at him and pulled the trigger, but nothing happened. Then Appellant pulled the trigger on his gun and heard a blast. Appellant stated that he could not remember anything after that. When Detective McCormack told Appellant that he did not believe D.R. had a gun and that the evidence did not show that D.R. ever had a gun, Appellant admitted it was true D.R. did not have a gun. Appellant further acknowledged that he knew the shotgun was dangerous, and he admitted that he had pointed a shotgun at kids four or five times before he shot D.R.
II. THE WAIVER AND TRANSFER PROCEEDING
The State filed a petition under section 54.02(j) of the Texas Family Code asking the juvenile court to waive its exclusive original jurisdiction over Appellant and to transfer him to the criminal district court for criminal proceedings. See Tex. Fam. Code Ann. § 51.04(a) (West Supp. 2016) (providing that the juvenile courts have exclusive original jurisdiction over all proceedings involving the delinquent conduct engaged in by a person who was a child at the time he engaged in the conduct), § 54.02(j) (authorizing the juvenile courts to waive their exclusive jurisdiction over, and to transfer to criminal district courts, [375] persons above the age of eighteen years); see also In re N.J.A, 997 S.W.2d 554, 555 (Tex. 1999) (stating that the juvenile courts have exclusive original jurisdiction over all proceedings involving a defendant who was a child when the alleged offense occurred). The juvenile court held an evidentiary hearing, and among the evidence the State presented was the testimony of Detective McCormack, Judge Mills, Officer Ferguson, and Officer Whisenhunt. Following the hearing, the juvenile court signed its amended order waiving jurisdiction and transferring Appellant to the criminal district court. As relevant to this case, the juvenile court made the following findings in its amended order:
The court finds that the Respondent is 18 years of age or older and that for a reason beyond the control of the State, it was not practicable to proceed in juvenile court before the 18th birthday of the Respondent^] and new evidence has been discovered since the 18th birthday of the Respondent that, after due diligence of the State, was not discovered by the State until after the 18th birthday of the Respondent. Specifically, the Respondent is the only known witness to the commission of this offense. When the Respondent spoke to the police in 1973, he told them that an intruder had broken into his home and murdered the victim, while the Respondent was outside playing basketball. Further when police searched the crime scene, they discovered that the rear sliding glass door to the Respondent’s home had been shattered by a large rock, and the console television in the living room was face down on the floor as if someone had broken into the home. Police also determined that the victim was shot with a gun belonging to the Respondent’s family and was stabbed with a knife belonging to the Respondent’s family. Shortly after the Respondent spoke with police, either later that night or the next day, the Respondent confessed to his mother and admitted that he had killed the victim, but Respondent’s mother did not disclose that confession to the police or to the [S]tate until 2015 despite having had contact with the police in 1973 after Respondent confessed to her. In fact, no confession by Respondent to any person was known by the police or the [Sjtate prior to the Respondent’s 18th birthday, nor was any confession known to the police or to the [Sjtate prior to 2015. Further, in 2015 shortly after Respondent’s mother made Respondent’s 1973 confession known to the police, the Respondent then also confessed to the shooting of the victim. The court finds that, due to the lack of sufficient evidence known to law enforcement and the [S]tate prior to Respondent’s 18th birthday in contravention of Respondent’s story about an intruder causing the death of the victim, and in light of new evidence [of] Respondent’s guilt discovered until after Respondent’s 18th birthday, it was not practicable to proceed prior to Respondent’s 18th birthday.
III. APPELLANT APPEALS
In his first issue, Appellant contends that the juvenile court abused its discretion by waiving its jurisdiction over this case and transferring him to the criminal district court. He specifically challenges the juvenile court’s findings under subsection 54.02(j)(4), which provides that before the juvenile court may waive its jurisdiction and transfer a person to criminal district court, it must
(4) ... find from a preponderance of the evidence that:
(A) for a reason beyond the control of the state it was not practicable to proceed in juvenile court before the 18th birthday of the person; or
[376] (B) after due diligence of the state it was not practicable to proceed in juvenile court before the 18th birthday of the person because:
(i) the state did not have probable cause to proceed in juvenile court and new evidence has been found since the 18th birthday of the person;
(ii) the person could not be found; or
(iii) a previous transfer order was reversed by an appellate court or set aside by a district court.
Tex. Fam. Code Ann. § 54.02(j)(4). In response, the State argues that we should overrule this issue because the record supports a finding under subsection 54.02(j)(4)(A) that for a reason beyond the control of the state, it was not practicable to proceed in juvenile court before Appellant’s eighteenth birthday. See id. § 54.02(j)(4)(A).
IV. JURISDICTION
The arguments raised in Appellant’s first issue, the State’s reliance on subsection 54.02(j)(4)(A) for the efficacy of the juvenile court’s amended waiver and transfer order, and our review of the record and governing legal authorities in light of the particularly unique facts of this case have led us to conclude that we must first consider (1) whether the juvenile court had subject-matter jurisdiction to conduct the waiver and transfer proceeding and render the amended waiver and transfer order that is the subject of this appeal and, consequently, (2) whether we have jurisdiction to decide this appeal. See Freedom Commc’ns, Inc. v. Coronado, 372 S.W.3d 621, 623-24 (Tex. 2012) (stating that appellate courts have no authority to consider the merits of an appeal from an order rendered by a trial court that lacked jurisdiction). Although neither party raised this issue during the juvenile court’s certification hearing or in them briefing before this court, subject-matter jurisdiction may not be waived, and we are obliged to consider it sua sponte. Id. (stating that jurisdiction must be considered, even if that consideration is sua sponte); Tex. Ass’n of Bus. v. Tex. Air Control Bd., 852 S.W.2d 440, 445 (Tex. 1993) (stating that subject-matter jurisdiction may not be waived). In undertaking that inquiry, we begin with an examination of the history of subsection 54.02(j)(4).
A. The History of Family Code Subsection 54.02(j)(4)
As it exists today, the Juvenile Justice Code is codified as Title 3 of the Texas Family Code. See Tex. Fam. Code Ann. §§ 51.01-61.107 (West 2014 & Supp. 2016). The legislature did not add the current version of subsection 54.02(j)(4) to Title 3 until 1995, See Act of May 25, 1973, 63rd Leg., R.S., ch. 544, § 1, 1973 Tex. Gen. Laws 1460, 1476-1477, amended by Act of May 19, 1975, 64th Leg., R.S., ch. 693, § 16, 1975 Tex. Gen. Laws 2152, 2156-57, amended by Act of May 8,1987, 70th Leg., R.S., ch. 140, § 3, 1987 Tex. Gen. Laws 309, 309, amended by Act of May 27, 1995, 74th Leg., R.S., ch. 262, § 34, 1995 Tex. Gen. Laws 2517, 2533-34. Before the current version of subsection 54.02(j)(4) went into effect, subsection 54.02(j)(4) of the Texas Family Code provided as follows:
(j) The juvenile court may waive its exclusive original jurisdiction and transfer a person to the appropriate district court or criminal district court for criminal proceedings if:
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(4) the juvenile court finds from a preponderance of the evidence that after due diligence of the state it was not practicable to proceed in juvenile court before the 18th birthday of the person because:
[377] (A) the state did not have probable cause to proceed in juvenile court and new evidence has been found since the 18th birthday of the person; or
(B) the person could not be found.
Act of May 8, 1987, 70th Leg., R.S., ch. 140, § 3, 1987 Tex. Gen. Laws 309, 309; see In re P.L.G., No. 05-95-00002-CV, 1995 WL 591208, at *2 n.l (Tex. App.Dallas Oct. 3,1995, writ denied) (not designated for publication) (setting forth the text of subsection 54.02(j)(4) as it existed prior to the changes the 74th Legislature made to that subsection in 1995). In 1995, the legislature enacted H.B. 327, which amended the 1987 version of subsection 54.02(j)(4) to its current form. See Act of May 27, 1995, 74th Leg., R.S., ch. 262, § 34, sec. 54.02, 1995 Tex. Gen. Laws 2517, 2533-34.
When comparing the current version of subsection 54.02(j)(4) with the previous version, it is evident that one change H.B. 327 made to subsection 54.02(j)(4) was to add for the first time the language that the State relies upon for the efficacy of the juvenile court’s amended waiver and transfer order in this case—that is, it added-the language authorizing a juvenile court to waive jurisdiction and transfer a person who is eighteen years of age or older and who committed an offense when he was a child to criminal district court by finding, by a preponderance of the evidence, that “for a reason beyond the control of the state it was not practicable to proceed in juvenile court before the 18th birthday of the person.” See id.
H.B. 327 expressly provided that the changes it made to the law, which included the addition of this new provision, became effective January 1, 1996. See Act of May 27, 1995, 74th Leg., R.S., ch. 262, § 105, 1995 Tex. Gen. Laws 2517, 2590-91. However, while the amended subsection became effective January 1, 1996, H.B. 327 also expressly limited the applicability of the changes it made in the following way:
(a) Except as provided by Subsection (b)