[THE BEST OF REDDIT SERIES] Jonny Cash shaking an inmate's hand at Folsom Prison, 1968

"Johnny Cash shaking hands with Glen Sherley during Cash’s performance at Folsom Prison, 1968 (photo by Jim Marshall)."
According to Google he was in for armed robbery at the time and wrote songs when he got out until he committed suicide in 1978.

source:https://goo.gl/hrWpf6