was he a rival gang or -- >> no, he was a white guy. he wasn't an asset to us as a gang or he wasn't an asset to his own race. and he was just a headache. >> most shu inmates are single-celled. but due to overcrowding, that's not always possible. a circumstance farmer used to his advantage. >> i moved in with the guy to take him out. >> and when you say he was taken out, what happened? did you personally -- >> my job was to go in there and kill him. and i went in there with the intention of killing him, but i stabbed him several times and the damn knife bent. we used a knee brace. we have to be real resourceful in the shu, what we can use for weapons. we used an aluminum knee brace. this was a big guy, so i went after this guy and i hit a bone and the knife had bent on the third time. so he got lucky. >> like other inmates who find themselves growing old in the shu, farmer eventually quit his gang. >> i got tired of the impulsive subjective reasoning for people doing things. we were actually killing people that didn't deserve to be killed. coming up on "lockup: raw" --