Answer: I'm gonna try my best to help....maybe the glass of water could help maybe the eyewitness fingerprints may be on it, there are shoe print marks everywhere maybe that could help because if there was an eyewitness there would be different shoe marks from the murderer's unless they wore the same shoe...but I doubt it. And also with the bathroom tap water still being on, there could also be fingerprints on the knob, maybe that's how they got water in that glass cup? also the mirror was broken so there must have been a fight or somebody broke it? and if someone did break it there must be blood on the glass!
Explanation: I tried my best if you still need help just ask and I will try my best :)
