He knew many secrets, not only about CIA prisons.
You honestly think Kaczynski would tell him anything worth knowing?
Lepper knew nothing, and if he did, he would've shouted about it from the rooftops. He was a populist, not a guy who was going to keep things to himself. Don't you think that if he knew stuff, he would tell everyone in order to make people think "Hey, what a good guy, he finds out stuff and tells everyone"?
today's news show plenty of people who doubt Lepper really committed suicide
Crazy, and shameful that they won't let him rest in peace.