Peo v. Landrock

CourtColorado Court of Appeals
DecidedMarch 27, 2025
Docket21CA1914
StatusUnpublished

This text of Peo v. Landrock (Peo v. Landrock) is published on Counsel Stack Legal Research, covering Colorado Court of Appeals primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

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Peo v. Landrock, (Colo. Ct. App. 2025).

Opinion

21CA1914 Peo v Landrock 03-27-25

COLORADO COURT OF APPEALS

Court of Appeals No. 21CA1914 City and County of Denver District Court No. 19CR6076 Honorable Edward D. Bronfin, Judge

The People of the State of Colorado,

Plaintiff-Appellee,

v.

Sean Landrock,

Defendant-Appellant.

JUDGMENT AFFIRMED

Division IV Opinion by JUDGE GROVE Harris and Pawar, JJ., concur

NOT PUBLISHED PURSUANT TO C.A.R. 35(e) Announced March 27, 2025

Philip J. Weiser, Attorney General, Paul Koehler, Senior Counsel, Denver, Colorado, for Plaintiff-Appellee

Megan A. Ring, Colorado State Public Defender, James S. Hardy, Lead Deputy State Public Defender, Denver, Colorado, for Defendant-Appellant ¶1 Defendant, Sean Landrock, appeals his judgment of conviction

entered upon a jury verdict finding him guilty of second degree

murder and three counts of misdemeanor child abuse –

knowing/reckless, no injury. We affirm.

I. Background

¶2 The jury could have reasonably found the following facts from

the evidence introduced at trial.

¶3 Landrock and the victim lived together with the victim’s three

sons, aged five, four, and one. Their relationship was difficult due

in part to the victim’s depression and unhealthy coping

mechanisms, which included suicidal ideation and self-harm.

¶4 On the day of the victim’s death, her five-year-old son was

found screaming outside of their apartment that his mom was dead.

When officers arrived, the child told them Landrock had shot his

mother. They found the victim dead on her apartment floor with

her one-year-old son alive near her. She had been killed by a single

shot to the chest, but she also had a stab wound in her upper right

chest; a shallow, six-inch cut on her neck; cuts on her forearm;

bruises on one of her arms and under her right eye; and several

lateral scars on her forearm and thighs. A shotgun lay four feet

1 from her left foot and six feet from her left hand, and her bloody

handprints and footprints were spread around the apartment’s

living room.

¶5 The prosecution charged Landrock with first degree murder,

three counts of child abuse, and one count of tampering with

physical evidence.

¶6 At trial, Landrock claimed the victim committed suicide. He

presented evidence that he had left her on the day of the shooting

because he could not take her self-destructive behavior anymore

and asserted that she shot herself because of his departure. In

support of this theory, a defense expert opined that suicide could

not be ruled out because the shotgun’s muzzle had been in contact

with the victim’s body when it fired.

¶7 In contrast, the prosecution, in support of its theory that

Landrock was the shooter, presented forensic evidence suggesting

that the shotgun was several feet away from the victim when it fired

and that it had been wiped down afterward, along with testimony

from the victim’s son and individuals with whom he interacted

shortly after the shooting. The prosecution also offered testimony

describing the couple’s turbulent relationship, including a

2 neighbor’s description of an altercation that she overheard the night

before the victim’s death.

¶8 A jury found Landrock guilty of second degree murder and

three counts of misdemeanor child abuse. On appeal, Landrock

contends that the district court reversibly erred when it (1) admitted

certain expert testimony from the prosecution while excluding other

expert testimony from the defense; (2) failed to suppress statements

made by Landrock to police after he had invoked his Fifth

Amendment rights; (3) improperly admitted other acts evidence and

hearsay evidence; and (4) failed to instruct the jury that

manslaughter ― aiding suicide is a lesser included offense of first

degree murder. He also contends that the cumulative effect of these

alleged errors deprived him of a fair trial.

II. Expert Testimony

¶9 Landrock contends the court reversibly erred by denying his

request for an evidentiary hearing on the admissibility of testimony

from two prosecution experts while also placing limitations on a

similar defense expert. We are not persuaded.

3 A. Standard of Review and Applicable Law

¶ 10 We review a district court’s ruling on the admissibility of

expert testimony and its decision whether to hold an evidentiary

hearing for an abuse of discretion. Kutzly v. People, 2019 CO 55,

¶ 8; People v. Rector, 248 P.3d 1196, 1201 (Colo. 2011). A trial

court abuses its discretion only when its ruling is manifestly

arbitrary, unreasonable, or unfair. King v. People, 785 P.2d 596,

603 (Colo. 1990).

¶ 11 The standard for evaluating the admissibility of expert

testimony in Colorado is outlined in People v. Shreck, 22 P.3d 68

(Colo. 2001). Under Shreck, a court may hold an evidentiary

hearing to make specific findings under CRE 403 and CRE 702

about the reliability of the scientific principles involved, the expert’s

qualifications to testify to such matters, the usefulness of the

evidence to the jury, and its potential prejudice. But a court is not

required to hold a hearing provided it has before it sufficient

information to make those findings. People v. Whitman, 205 P.3d

371, 383 (Colo. App. 2007); People v. McAfee, 104 P.3d 226, 229

(Colo. App. 2004). This discretion comports with the court’s need to

“avoid unnecessary ‘reliability’ proceedings in ordinary cases where

4 the reliability of an expert’s methods is properly taken for granted,

and to require appropriate proceedings in the less usual or more

complex cases where cause for questioning the expert’s reliability

arises.” Kumho Tire Co. v. Carmichael, 526 U.S. 137, 152 (1999);

Ruibal v. People, 2018 CO 93, ¶ 13.

¶ 12 The focus of a Rule 702 inquiry is whether the scientific

evidence proffered is both reliable and relevant. In determining

whether the evidence is reliable, a trial court should consider

(1) whether the scientific principles on which the witness’s opinions

are based are reasonably reliable and (2) whether the witness is

qualified to opine on such matters. Shreck, 22 P.3d at 77.

B. Prosecution Experts

1. Additional Facts

¶ 13 Before trial, the prosecution endorsed as expert witnesses two

forensic scientists who worked in the field of firearm and toolmark

identification at the Denver Police Department Crime Laboratory.

¶ 14 The first expert, Nathan Von Rentzell, examined the shotgun

for functionality and to assess the possibility of an accidental

discharge. Among other things, he performed a “shock test” in

5 which he struck the gun with a mallet from multiple directions to

see if it would fire without the trigger being pulled.

¶ 15 The prosecution’s other firearms expert, Zachary Kotas,

conducted testing intended to show how far the muzzle of the

shotgun was from the victim when it was fired.

¶ 16 In a pretrial motion, Landrock asserted that Von Rentzell’s

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Vasquez v. People
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People v. Shreck
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People v. Greenlee
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