@matigo I think it's the only non-fiction work he's done. The book is about a murder in Oklahoma in the 1980s', and the man, Ron Williamson, who was charged, convicted, sentenced to death, and then was cleared of the charges.
Time to see if season 2 of True Detective is any good. I'm not expecting anything near as good as season 1.
Speaking of books, I've just started reading "The Innocent Man" by John Grisham, and I've been enjoying it so far. I hadn't heard of it before, but saw it at Barnes & Noble the other day in the True Crime section. Turns out it was Grisham's first non-fiction book and was published about 10 years ago.