An Oregon resident has been found guilty in the fatal stabbing of a U.S. Postal Service mail carrier during a dispute at their apartment complex.

Last week, 53-year-old Chad Michael Westover was convicted of second-degree murder and unlawful weapon use for the death of 43-year-old Tristan Salvatore Thomas, as reported by the Clackamas County District Attorney’s Office.

The incident occurred on September 21, 2024, when Westover and Thomas became embroiled in a confrontation. During the altercation, Westover instructed bystanders to stop recording so he could “handle it” himself. He then attacked Thomas with a kitchen knife in full view of Thomas’s mother. Tragically, Thomas succumbed to his injuries at a hospital on October 3, 2024.

“Several neighbors, along with Thomas’s mother, implored Westover to cease his attack as he pinned Thomas down and repeatedly stabbed him with the knife,” stated the DA’s office. Thomas sustained multiple stab wounds, including a significant 4-inch gash to his left vertebral artery. Westover also suffered injuries during the encounter.

Following the attack, Westover fled but was apprehended days later. His defense argued that Thomas was the instigator, describing him as “unreasonable and unstable” and asserting that he was intoxicated on the night of the incident, according to prosecutors.

Westover’s sentencing is scheduled for November 17.

As Law&Crime previously reported, the incident happened at the Twin Creek Apartment complex on SE Sunnyside Road in Clackamas, just outside of Portland,  the Clackamas County Sheriff’s Office said at the time.

According to a 168-page probable cause arrest affidavit obtained by Law&Crime, the ordeal actually began earlier in the day when Thomas confronted a neighbor, Christopher Stewart, over the way he parked his motorcycle at the apartment complex where they both lived. Stewart allegedly assaulted Thomas, sending him to the hospital. Deputies did not believe there was enough probable cause for an arrest, the affidavit stated.

After receiving treatment, Thomas returned from the hospital later on in the day. Meanwhile, Stewart and Westover were at a party in the complex hosted by 48-year-old Samantha S. Christensen. At some point, Stewart received a call from his teenage daughter claiming that she was being followed by a “strange man” in the complex, the affidavit said. Stewart, Westover and Christensen left the party to investigate. They reportedly determined the man was Thomas, who was allegedly carrying a butcher knife.

Much of what occurred next was captured by neighbors taking video of the altercation and from Thomas’ calls to 911, authorities said. Deputies did not release footage, but the affidavit included stills.

In the call, Thomas told dispatchers that four people later identified Stewart, the teen daughter, Westover and Christensen were outside of his apartment and he feared for his safety. A video taken by a neighbor allegedly shows Westover say, “If you guys are done filming, I’ll take care of it,” to which Christensen, who is the defendant’s cousin, replies, “I’m done, take care of it, Chad.”

Westover goes off screen and apparently attacked Thomas, the affidavit said. During the altercation, Thomas “repeatedly screams for help” as Westover assaulted him, deputies wrote. Stewart yells at Westover to “let him go, let him go” as Thomas exclaims “He’s stabbing me!,” the affidavit said.

The neighbor taking the video urges someone to call 911 because “that’s a lot of blood!” per the affidavit. Westover’s assault lasted nearly five minutes, authorities said. He allegedly then threw the knife atop Thomas and walked away. Deputies say Thomas never caused harm to Westover.

“After leaving Mr. Thomas in a pool of his blood, Defendant left the scene with Samantha Christensen and at no point called 911,” detectives wrote. “In fact, I know that Samantha Christensen took Mr. Thomas’s phone from the scene, and when 911 called back from the dropped call, she told them that everything was ‘fine’ prior to hanging up the call.”

Christensen turned herself into the Clackamas County Jail on charges of first-degree assault, tampering with physical evidence, hindering prosecution and interference with making a report.

Post Miranda, Christensen told detectives it was Thomas who first attacked Westover with the butcher knife and sliced him under the eye and stabbed him under the rib cage. She took photos of his injuries. Investigators called the placement of the wound “curious” and noted he had no defensive wounds. Deputies also said when Westover went to the hospital for treatment, he claimed he had been in a motorcycle accident.

Thomas’ family started a GoFundMe to cover funeral expenses and other costs.

“Tristan was a pillar to his community giving back by delivering mail to the same community he grew up in. He is described as quirky, boisterous, lovable, vibrant and had a presence about him that brought a smile to many, you always knew when he was in the room,” the fundraiser said.