why, brad o'born, discredit boyfriend. rs put bread on the stand. it was a risky strategy. >> i was a heroin at it attic for quite some time. >> the story brad told that of his relationship with this nice girl hannah, was for sure, a presentation. >> i was not a good boyfriend. >> can you explain to us why not a good phone boyfriend means? >> i was abusive. >> did you verbally abuse her? >> yes. >> did you physically abuse her? >> you need to answer out loud. >> yes. >> but testified that just days before hanna disappeared, they'd had a big fight about him cheating on her and said that's when she scratched him. >> does that picture fairly and accurately represent the scratches that are on your arms? >> yes. >> most painful, he said, was the fact that he had introduced hannah to denny in the first place. >> so, if not for you, hannah hill would never have met denny ross. is that what you're saying mr. o'born? >> yes. >> did you believe blame yourself for hannah's murder? >> yes. >> do you still blame yourself for hanna's mur