>> i've worked with mentally ill people for the last 35 years and i've never been injured, never been attacked. so i'm just comfortable with it. >> but even the most vigilant staff cannot prevent violence from erupting. >> there's only been one murder in this prison. it's been in this mod. it was in cell 13 downstairs. a guy strangled a guy to death. >> on august 22nd, 2004, carl ables earned the infamous distinction of being the only spring creek inmate to kill another prisoner. >> put a cellie in with me, the guy was doing life, in for homicide for killing his mom. which is disgusting. but this mental illness thing. he got 39 years suspended and eligible for parole in 20 years. he's bragging about that, i killed mommy, and i'm getting out in 20 years. blah, blah, blah.