Why a person would remove a body: I guess someone could think that it would be more difficult to convict them for murder without a body. This could be a crime of passion or something that wasn’t fully thought out. Maybe they planned it and then freaked out after the deed was done. Second thoughts. They panic and decide to get rid of the evidence. People do incredibly stupid things all the time thinking they’re covering their tracks. The fact that they didn’t stage the scene and then a ransom note goes out 72 hours later, which may or may not be real, along with the message that they won’t be hearing from them, the perpetrator, again = amateur.