It was reported that he might have been involved in a shooting in Skyway, which is in the Seattle Metro area. There was an argument at a party and the hosts kicked a person out. That person, thought to be Barnes returned, shooting four people. He might have been heading out to the Park to hide out, but thought when rangers tried to stop him it was for the shooting. I haven't heard any indication that the Rangers knew he was connected to another shooting.
He had a lot of tattoos. I'm wondering if he had any gang affiliations.