Cool. Dark and twisted, which is always a good thing.
Two points though, “assailant” should be plural in this segment: “So the assailant, whoever they were.” Also, I think you should change “The lack of bullet holes,” to something like “The small number of bullet holes.” Not that exactly, because it’s bad. But “the lack of” indicates that there are none, when you intend to say that there are very few given the precision. Make sense?

I really liked the rundown of the crime scene. Made perfect sense. Great eye for the detail. @John Perkins: nice editing. I missed those on the first read through.