there are 1,300 inmates serving life sentences at kern valley. their crimes were often cold-blooded. >> i'm here for aggravated mayhem, attempted murder, kidnapping, and great bodily injury. >> i'm in here for the heat of passion. i caught my wife with somebody and killed her. >> for some of these inmates, the prospect of spending decades behind bars affects their ability to function. for others, a prison job can give them a sense of purpose. they work in the kitchen preparing and serving the food. they serve as porters, clerks, and barbers. marcus armstrong and jeffrey cattera know it's likely they'll never see the outside of prison again. >> january 13th, 1989, i committed my crime, was arrested the same day. it was a murder/robbery. i got life without the possibility of parole. stupid. stupid. i was a kid. did the wrong thing. you know? i've never denied my crime. i accept responsibility for what i did. although i regret what happened and -- i mean, it happened. i can't take that back. >> i'm in here for first-degree murder. i have 25 to life