Arcan Cetin, 20, made a brief appearance in Skagit County District Court yesterday and his bail was set at USD 2 million.
Court documents released before the hearing said Cetin confessed to the slayings after his arrest, telling detectives who interviewed him that "he did bring the rifle into Macy's and shot all 5 victims."
Cetin was arrested Saturday, a day after the gunman opened fire in the department store's cosmetics department Friday night, killing a man, a teenage girl and three women.
"The only thing that we want to say at this time is that we both are totally devastated by what happened," said David Marshall, who attended the hearing with Cetin's mother.
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Cetin's lawyer, Keith Tyne, did not speak with reporters. Cetin was described by one neighbour as so "creepy, rude and obnoxious" that she kept a Taser by her front door. He also had a string of run-ins with the law in recent years, including charges he assaulted his stepfather.
Cetin immigrated to the US from Turkey and is a legal permanent resident, officials said. He is expected to make an initial court appearance Monday.
On Sunday, they searched Cetin's apartment and were seen carrying boxes from a rear, upstairs unit. The four-unit building was surrounded with yellow police tape. Detectives would not say what they found.
Amber Cathey, 21, lived in an apartment next to Cetin for the past three months and said she was so frightened by him that she complained to apartment management and kept a stun gun handy. Cathey said she blocked him on Snapchat after he sent her a photo of his crotch.
"He was really creepy, rude and obnoxious," Cathey said. She said she would try to avoid him by walking the long way around to her apartment if she saw his car in the parking lot. The two were in high school together as well, and Cathey said he acted the same way then.
In the assault case, Cetin was told by a judge last December that he was not to possess a gun, the newspaper reported. However, the stepfather urged the judge not to impose a no-contact order, saying his stepson was "going through a hard time.