Brunn's 'confession' was rife with lies and half-truths, IMO, to make himself (in his mind) look like less of a monster.
Warning: Graphic
1) He says he didn't touch her sexually. Are we to believe the medical eximiner lied about something being inserted into her anus, or that Jorelys did that to herself at his request? And she damaged herself enough that the medical examiner could tell she'd been violated that way?
2) He says he panicked suddenly, after Jorelys asked to go to the bathroom, and that's when he asked her to lay in the tub, tied her wrists, put a rag in her mouth, duct tape over her mouth and had his carpet cutter and her skate handy. All that handy in the bathroom for a sudden panic? Riiiiight.
3)He states her slashed her throat, and when that didn't kill her, he hit her in the head with the skate 4 or 5 times. He didn't explain when or why he stabbed her in the face and chest. Are we to believe that Jorelys stabbed herself in the face and chest? Because the ME stated she was also stabbed in the face and chest. Did he think, "Oh, I'll just molest her then send her on her way....oh wait, she might tell; better kill her .... but wait, let me stab her in the face, that might kill her!"
He enjoyed causing her pain. He's sadistic. He wasn't trying to kill her when he inserted something into her, nor when he stabbed her in the face. That's just being a monster.