don. >> i just start screaming no, over and over again. moy dad was obviously a mess. >> and the news soon made its way to oklahoma where don's older children lived. >> my mom called me. and it was probably midnight. and told me the news. and he just, at first, i was like, no, this isn't real. this stuff don't happen. you just see this on tv. >> but he was gone. >> he was gone. it was horrible. >> this is an intimate murder. a hands-on murder. >> yeah. very personal, violent. >> who would put a target on your brother of all people? mr. sunday night spaghetti? >> my first thought was terry. i even told the detective that. >> terry white, christine's husband, sienna's stepfather. >> don told me a lot about him. i knew there were altercations in the past. >> the detective went to see