i know how to defend myself. >> reporter: martin corona claims to be reformed. claims remorse. for those he hurt. >> i tried reaching out to them and apologizing. >> reporter: that former model he shot point blank in the head survived. corona reads from a letter he wrote to her. >> i can never find the words to apologize for my emotion other than hate from you. but i truly am sorry. >> reporter: she says she does not forgive him. apparently others do. >> you hear somebody tell you that they didn't blame you for doing the things that you did, it's -- it's a little overwhelming. still hurts, still bothers me. >> reporter: as far as i can tell, martin is one of the worst of the worst. >> yeah. yeah. he was. not anymore. and let's hope that, you know, he stays that way, you know? >> reporter: after our interview, corona violated his probation, tested positive for cocaine and meth. after a short stint in jail, he's about to be released again. >> there's mornings i wake up and i wash my face and look in the mirror. and i can still see the monster that i once was. you can never make a