[He wants to believe her and the others that told him that. He does. But it's hard not to blame himself for this.]
I was owned and... I tried to run away, escape it so I wouldn't have to kill anymore. So they sent someone after me to punish me. He hurt her and killed her to get to me. To enrage her brother and get him to rally his friends for vigilante justice.
They beat me within an inch of my life and I killed them out of rage, including the man sent after me. I was arrested... I was supposed to go to a jail on that planet but wound up here.
So no, I doubt anyone knows I didn't kill that girl, except maybe the wardens here.