Sometimes everything just works out... Sometimes.
So The Police Officer (Poor poor woman) entered and immediately found the bodies. Apparently The Slenderman had told them I was running a marijuana growing operation so she was incredibly surprised to find the bodies. The story probably would have ended there if she hadn't decided to examine the body on the couch.
So it seems The Dying Man can possess corpses. Did anyone else know about this? I sure didn't. I assume the police officer didn't either. She does now. So now I have The Dying Man in the form of a Female Police officer locked in my bathroom. I wonder how long it will take for the police to send out more officers? Hopefully long enough for this game to end without me in a jail cell or on trial for murder and imprisoning an officer of the law.