Investigators focused on the gun’s location, Breanna Canter’s injuries and changes in Tyler Nelson’s account before his 40-year sentence.
DENVER, Colo. — The shotgun was outside its carrying case when police found it, a detail that investigators said clashed with Tyler Nelson’s first explanation of how his wife was fatally shot and became part of a case that ultimately sent him to prison for 40 years.
Nelson told police that the shooting of his wife, 30-year-old Breanna Canter, was an accident during a struggle over gun safety. Detectives said the physical evidence did not fit that account. Nearly two years later, a Denver jury convicted Nelson of second-degree murder and first-degree assault, and District Judge Stephanie Scoville sentenced him Sept. 30 to four decades in a Colorado correctional facility. The verdict resolved the central conflict that had existed from the first hours of the investigation: Nelson described an unintended discharge, while police said the bedroom scene, Canter’s injuries and his changing statements pointed away from the explanation he initially gave them.
The investigation began shortly after 1 a.m. on Sept. 24, 2024, when Nelson called 911 from the couple’s apartment in the 600 block of South Dayton Street. He reported that Canter had been shot. Officers who arrived found her on the floor of the main bedroom. A young son shared by the couple was also in the home but was not injured. Near an open closet, officers saw a shotgun positioned with its muzzle facing upward. Canter was later identified by the Denver medical examiner, which determined that she died from a shotgun wound. Police then began comparing what Nelson told them with what officers could observe in the apartment.
Nelson described an argument that he said preceded the shooting. According to reporting based on the probable cause affidavit, he told investigators that Canter had complained that he was playing games on his cellphone and was not paying attention to her. He said he went into the bathroom, then returned and found Canter with the shotgun. Nelson said she was asking him about the weapon’s safety and that he tried to take it from her. He also told investigators that both of them had been drinking and that he believed handling the gun under those circumstances was unsafe.
His account then became more specific. Nelson said the shotgun had not been removed from its soft carrying case during the encounter. He claimed that as he reached for the weapon, his knuckle made contact with the trigger through the case and caused it to discharge. That detail gave investigators something concrete to test against the physical scene. The problem, according to the records described by news organizations, was that police did not find the shotgun enclosed in the soft case. It was outside the case, leaning near the closet. When detectives pressed Nelson on the discrepancy, he said he was no longer sure whether the gun had remained in the case or at what point it might have been removed.
The location of the gun was not the only issue police identified. Investigators also compared Nelson’s description of the weapon’s position and movement with Canter’s wounds. The probable cause material described injuries involving the upper right chest and chin area and said they did not appear to line up with the way Nelson said the shotgun fired. A preliminary examination of the bedroom likewise did not match his explanation, according to reports. Those findings did not, by themselves, publicly answer every question about the shooting, but they gave detectives grounds to challenge the accidental-discharge narrative rather than accepting it at face value.
Police also documented Nelson’s conduct after he was taken from the apartment and questioned. An arrest affidavit reported by news organizations said he did not ask how Canter was doing and did not ask about the welfare of the couple’s son during much of his time at police headquarters. Investigators wrote that he showed little emotion about what had occurred. Other reporting on the same affidavit said he became upset when officers informed him that Canter had died. Authorities included those observations in their records, but the stronger factual conflict in the public account of the investigation concerned the physical scene itself: the shotgun’s location, the wound evidence and Nelson’s altered recollection about whether the weapon was inside its case.
Nelson was initially arrested on suspicion of first-degree murder and first-degree assault. That first-degree murder allegation did not become the jury’s final verdict. When the case went to trial in August 2026, jurors instead convicted him of second-degree murder along with first-degree assault. The difference is significant. Colorado law defines second-degree murder, in its ordinary form, as knowingly causing the death of another person. It is classified as a class 2 felony. The verdict therefore represented a finding of murder even though the jury did not return a first-degree murder conviction.
The verdict also meant that Nelson’s account could no longer be treated merely as one unresolved version of an unexplained shooting. Before trial, investigators had alleged that his story conflicted with the evidence. After trial, a jury found him criminally responsible for Canter’s death beyond a reasonable doubt under the charge of second-degree murder. The available public reporting does not provide a complete transcript showing how jurors weighed each individual piece of evidence, so it would be improper to claim that any single discrepancy determined the outcome. What can be said is that the jurors were presented with a case that began with an accident claim and ended with a murder conviction.
Scoville’s sentencing on Sept. 30 added the final major trial-court consequence. She ordered Nelson to serve 40 years in prison. Colorado legislative materials list second-degree murder as a class 2 felony and identify enhanced prison ranges when a class 2 offense is treated as a crime of violence. The state’s crime-classification guide lists 16 to 48 years for a class 2 crime of violence. Nelson’s 40-year sentence falls toward the upper part of that span. Public accounts of the hearing do not provide a full sentencing transcript, so the precise weight Scoville assigned to the evidence, the circumstances of the offense or other statutory considerations has not been established in the reporting reviewed for this article.
The sentence came more than two years after Canter was killed. The passage of time is important because the case evolved in stages. In September 2024, police were still reconstructing an early-morning death and testing the account of the person who had called 911. By the time Nelson was arrested, investigators had already identified inconsistencies they believed undermined his explanation. In August 2026, the question moved from probable cause and accusation to a jury’s determination of guilt. The following month, the court moved from conviction to punishment, imposing the 40-year prison term.
Denver District Attorney John Walsh emphasized Canter rather than the mechanics of the investigation when his office announced the sentence. He described her as a loving mother and beloved daughter and said her death was a terrible tragedy, especially for her young son and her parents. Walsh said the sentence imposed a heavy consequence on Nelson and expressed hope that it would provide some measure of justice for Canter’s relatives and friends. His remarks reflected the other side of a case that had often been described through forensic discrepancies: behind the questions about the shotgun and Nelson’s statements was the death of a 30-year-old woman in her bedroom.
The presence of the couple’s son also remained an important fact throughout public reporting. Police said he was inside the apartment when the shooting occurred and was unharmed. Authorities have not publicly released extensive personal information about the child, and the available accounts do not establish that he witnessed the shooting. Reports that go beyond those verified facts would risk attributing experiences to a minor that have not been confirmed. What is known is that the child lost his mother and that prosecutors cited that loss when discussing the impact of Canter’s death.
The evidence dispute that shaped the case can be reduced to a clear contrast without overstating what the public record shows. Nelson said the shotgun went off accidentally as he tried to take it from Canter. He initially said it was still inside a soft case. Officers found it outside the case. He described a particular struggle and accidental trigger contact. Investigators said Canter’s wounds and their preliminary examination of the scene did not appear consistent with that version. When questioned further, Nelson became uncertain about a detail he had first described more definitively. Those were investigative findings before trial; the jury later supplied the legal conclusion by finding him guilty of second-degree murder.
The contradiction that first drew investigators’ attention ultimately became part of a much larger evidentiary record placed before a jury. Nelson said the shooting was accidental; jurors found him guilty of murder. Scoville’s 40-year sentence gives that finding its present legal consequence, while the available public record reviewed through Nov. 10 does not show a subsequent court decision disturbing either the verdict or the punishment.
Author note: Last updated November 10, 2026.