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.