Bill Lindsay, 38, lived behind Rader and said his wife caught Rader in their adjoining backyards filming the back of their house.
"He really acted really funny," said Lindsay, a truck driver. "I'd be on the road and my wife would tell me, 'Dennis has been out again, taking his pictures.'"
Jason Day, 28, said his brother was in Rader's Cub Scout pack at the nearby Park City Baptist Church, but their mother pulled him out because of Rader.
"It was his demeanor," he said. "He was so strange."
Well, lots of people are eccentric. Many of his neighboors and contacts agreed that he was. But none of them suspected that he could have been BTK.