mentally, emotionally. >> luis ramon was 15 years old at the time of the murder. when we met him six years later, he told our producer he relates with two notorious and fictional movie killers. >> i believe i become a killer like michael myers on "halloween" and jason voorhees on "friday the 13th." i'm just fascinated with the way they were. i heard voices like jason voorhees. like one of my characters. they told me like how to kill people and when to do it. the devil. i was possessed by the devil for six years, but he was with me for 17. there's a demon that lives outside my window right now. jim, he lives outside my window. he's a demon. most of the time he just sings to me or hums. he aggravates me sometimes. and i can't sleep. >> when our producer noticed his scarred arms, she learned that sometimes ramon directs violence at himself, as well. >> what are those scars down here? >> i cut my vein open about three times.