John David LaDue readily admits he came from a good home and says he was never bullied, CNN reports, but something in him drove the 17-year-old Minnesotan toward an obsessively detailed plot -- one in which, he said, he wanted to kill his family, set off bombs at a school and then shoot students.
"I think I'm really mentally ill," he told police. "And no one has noticed. I've been trying to hide it."
Transcripts of LaDue's police interviews were released Tuesday. They fill more than 140 pages.
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