Just because some of the world's most notorious criminals are serving multiple life sentences in prison doesn't mean they haven't been keeping busy. In fact, people such as the Menendez brothers, the Charles Manson "family" and more have gotten college degrees, married and more. 

With so much time on their hands, these criminals have had to figure out what to do with themselves, as most of them have been denied parole (some even on multiple occasions). 

So what is life like behind bars? Read on to hear more:

O.J. Simpson, OJ Simpson, Parole hearing

Jason Bean/The Reno Gazette-Journal via AP, Pool

Lyle Menendez, Erik Menendez

AP Photo/Kevork Djansezian

Charles Manson, True Crime

California Department of Corrections and Rehabilitation

Scott Peterson, True Crime Week

AP Photo/Justin Sullivan, file

Mark David Chapman, John Lennon, True Crime Week

Wende Correctional Center; Michael Ochs Archives/Getty Images

Brian David Mitchell, True Crime Week

Ravell Call-Pool/Getty Images

Rudy Guede, True Crime Week

TIZIANA FABI/AFP/Getty Images

Charles Cullen, True Crime Week

John Wheeler/Getty Images

David Berkowitz, True Crime Week

Al Aaronson/NY Daily News via Getty Images

Gary Ridgway

AP Photo/Joshua Trujillo, Seattle Post-Intelligencer, pool

Law & Order True Crime: The Menendez Brothers premieres Tuesday, September 26 at 10/9c. 

(This story was originally published Thursday, Sept. 22, 2016 at 9:00 a.m.)

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