A trunk of a car won't get the body down the stairs.

The problem is getting the body to the car.
There is just too much against the "killed in the apartment" scenario.
Cody did pass a polygraph, and while not absolute, they only register false negatives less than 10% of the time. Further, it wasn't Cody's idea to stay and it wasn't due any intoxication. The conflict with the neighbor happened at around 3:00 AM, and that is what caused him to stay.
What I am wondering about is possibly buying, or selling, marijuana or some other substance. She told her mother that the reason her apartment was robbed was because someone was looking for marijuana.
I
could see a situation where someone involved in a transaction came to the door and Stauffer said, **My friend Cody is here, and I don't want him to see this. Let's do this in my/your car.**