They might try to make a big deal about the lack of blood in the trunk, but I think that only points to him being a big fat liar about carrying a dead body into the field and her feeling like she had fainted against his body. I think she was alive, he forced her, walking/dragging, into the field, raped her, and then stabbed her. The only clothing of hers that was found away from the body was her shorts and underwear; they were not securely ON her body anymore.
Considering one of the stab wounds was through the front of the sports bra, and the wounds were on her rib cage, I think he stabbed her and then raped her while she was dying.
