Donald Marshall Jr, a native Nova Scotian innocent but spent years in prison for a murder he didn't commit. There was also the fellow in Manitoba--David Milgard, he was also innocent and I'd go as far as saying the police framed him.
Mike if you want to read a book that details the life of a non-violent petty criminal read Go Boy by Rodger Caron,
he spent most of his life in prison. He was a youth when he first went to prison and with each release he would commit petty robberies and be sent back to jail. After writing his book he managed to stay out of jail, but I heard on the news a few years ago that he was arrested for holding up a Zellers store in Ontario. It appears he has MS and he couldn't function outside of prison with this desease, sooooooooo sad. I'd recommend this book to anyone who wants to understand what "Prison" is really like, it's a great read.