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On Wednesday, December 19, 2018, at 9:34 p.m., a Washington County Sheriff’s Office deputy was at the Sheriff’s Office Bethany Precinct when he was approached by a man. The man told the deputy that an unknown person stabbed him in the back while he was sitting outside the Bethany Starbucks. The Bethany Starbucks is located a block away from the Sheriff’s Bethany Precinct.
The deputy rendered medical attention to the man until Tualatin Valley Fire & Rescue arrived. The man was treated and released at the scene. The deputy relayed the description to deputies who conducted a thorough search of the area.
As Sheriff’s deputies continued their investigation, a K9 tracked to a neighborhood directly north of the Bethany Shopping Center. The suspect was not located. It is believed the two men did not know each other.
Deputies were able to obtain security footage from surrounding businesses along with additional evidence that led them to believe 19-year-old Tristan Mann was responsible for the stabbing.
Deputies converged on Mr. Mann’s residence in the 15200 block of Northwest Decater Way, which is very close to where the earlier K9 track concluded. At about 10:58 p.m., Mr. Mann surrendered at his residence and was arrested without further incident.
Sheriff’s deputies seized a knife and other evidence believed to be used in the stabbing. Tristan Shay Mann was lodged in the Washington County Jail. He is charged with second-degree assault and unlawful use of a weapon. He is held on $250,000 bail. He is due in court at the Law Enforcement Center at 3:00 p.m. today.