Sounds like they had a fight either in the next room or outside, room had black bugs that were not mosquitoes all over the walls, the temperature was about 66° when walking into the room, bedspread, stains, the entry door lock looks like it was loose. Maybe someone trying to use forcible entry at some point in time., the key did not work in the deadbolt lock only the bottom entry, had like an ammonia smell the next morning, and the floors were all sweaty after raising the temperature to mid 70s.