Is Sherol Donla a Killer?

Garry Hilton pleads guilty to the murder of meredith emerson. Authorities find her decapitated remains 50 miles from where she went missing. Garry tells investigators that he ambushed meredith on the hiking trail with a knife, and he kidnapped her to steal her credit cards. He kept her alive in his van for four days during which time he raped her repeatedly.