Another thought..
Why, what on earth would make RS run and hide in the toilet, of all places?? I am sure only a very very bad event. Think about it, she was 30 (mature), a Leo (strong traits), was known to stand up for herself... She probably faught back with all her might, right up to the last 15 minutes where she had no other option than to run and take cover in a tiny, cornered in toilet (room within a room no least). Something happened between 2 and 3am, something terrible, that left marks on RS and on the wall above the bed. I think she somehow managed to get away (he is missing parts of his legs which must given her an advantage at some point) ran in bathroom as there was no other option (fight or flight, she was in the flight stage) and once that door slammed shut, she knew she was trapped, and going to die.
Her jeans out the window...that was perhaps a desperate attempt that she hoped would help the no doubt future investigation into her death.
The blood curdling screaming: I'm about to die. Hear me
Maybe he forced her to go into the toilet. He required her to be in there for his intruder story.