this is shawn mefford's story. >> my name is arthur mefford. i'm serving a 54-year to life sentence under the california three strikes law. >> arthur mefford was a career criminal with a string of aliases. these days he goes by shawn. >> i did drugs out there. i chased women out there. i shot dope for 20 years, and if i wasn't using you for my betterment and you weren't doing what i was doing, i was running over you and didn't care. >> but with a rap sheet that spans decades, there's one crime that still haunts him. >> i walked by this house. i thought it was empty. broke into the house. was confronted by a person, and i subdued him. i ransackled his house. i was in the house probably 15 minutes tops. >> mefford has never fully revealed all of the events that took place that night. he thinks he's finally ready to open up. >> hey, tower. >> but fears what may happen if he tells the whole story. >> you know, in my mind's mind tells me, you know what? suppress it, you know. deal with it yourself and be safe. >> on the yard the inmates have their o