This movie might be early to late 2000’s, but I’m not too sure. I don’t remember much. There’s a redhead woman and a man, and the man is a killer. She somehow ends up with him and they drive around and I think go to a hotel somewhere in the desert. She looks in the guys trunk and I believe there was a dead person in there. The guy ends up killing the woman, maybe with a shovel and puts her in the trunk. It’s not much, but it may help.