There’s a mountain of evidence here, and that’s without any physical evidence they may have gathered at the crime scene. You can’t exactly explain away 3 bodies at your house, especially with a history of violence and sexually motivated crimes. I’m sure his mom and girlfriend (the kidnap victim found in his car when he was arrested) will be able to contribute to the prosecutions’s case. Apparently the potential punishment for kidnapping with serious bodily injury is 25 years alone, and judging by his girlfriend’s injuries, that case definitely meets that criteria.