Hours after the shootings of two Minnesota lawmakers over the weekend, authorities asked David Carlson to identify his lifelong friend in a harrowing photograph.
Carlson says he had known and trusted Vance Boelter from the time the two played together as children. But he barely recognized the 57-year-old in the surveillance image police showed him of Boelter wearing a flesh-colored mask as he carried out what authorities described as a political rampage.
''The guy with the mask, I don't know that guy,'' Carlson said in a telephone interview with The Associated Press, recounting his decades-long friendship with a man he likened to a brother. Boelter's involvement in such an attack, he said, was as surprising to him as ''getting struck by lightning.''
''There was a darkness that was inside of him," Carlson said. "He must have kept it hidden."
As authorities piece together Boelter's movements and motivations, Carlson and others are conducting their own inventory of their interactions with the one-time pastor, wondering whether they missed any red flags.
Boelter is a married father of five but often stayed at Carlson's home in Minneapolis to shorten his commute to work. In hindsight, Carlson said, Boelter ''was a sick man'' and needed help, even if those around him didn't realize it in time.
Law enforcement has cautioned the motive could be more complex than pundits might prefer, even as Boelter's own disjointed writings suggest he was hell-bent on targeting Democrats.
Boelter has been charged with federal murder and stalking, along with state counts, in the fatal shootings of former Democratic House Speaker Melissa Hortman and her husband, Mark. He is also accused of wounding Democratic Sen. John Hoffman and his wife, Yvette.