. >> david monroe is serving a 15-year-to-life sentence after having pled guilty to second degree murder. >> i banged before. i have been on the streets before. i'm from stockton. i done did it before, all of it. everything you guys say you did, everything you guys think that you didn't did that we ain't did, we did it. >> it's really just about us not scolding the kids. it's not a scared straight. but we try to give you the communication part like look, man, this is what i did, this is what it got me. this is the trophy that i was trying to earn. is this what you want to earn? most kids they don't. do you want to come to jail at 15 years old? do you want to come to prison and have to be on the yard? yeah. stand up. let me see how tall you are. this was me. >> you was my size? >> this was me when i came to prison. >> they're 15, they look at me like oh my god, are you serious? that's usually what i get, are you serious? 15 years old, they locked you up? can they do that? >> at 15, monroe's involvement in gang violence changed his life forever. >> they say if you carry a gun, eventually y