>> it was shauna tiaffay's blood, and the pants were worn by noel stevens. >> that's kinda your storyhere, huh? >> that's kind of our story there. >> reporter: proof the homeless handyman george and shauna tried to help was a murderer. but could the story be that simple, really? listen to shauna's sister paula, for example, and things start to sound a bit more complex. >> well, i just think that he always loved himself more than he loved anyone else. and it was all about him and what he wanted. >> reporter: that was george she was talking about. the selfless firefighter had another side, said paula. >> the verbal abuse, the intimidation, the control. i mean, george was always a controlling guy. >> hold the camera in your hand. push it away from us. >> reporter: according to paula, george had become ever more controlling, and judgmental, especially about shauna's spending habits. >> first time at the beach. >> reporter: only got worse when shauna told george the marriage was over. >> he said, you know, "if you don't come back to me and we can't sort this out, you're gonna lose custody

. >> reporter: shauna tiaffay, loving mom by day, vegas cocktail waitress by night. >> i was at one ofe bars and i saw her walk by. every single head turned. >> it was after her shift that they found her, the victim of a ruthless attack. >> i mean, your heart just drops to your stomach.