for those not liking the murder scenario, evidence shows he was aware and operative, has to have operated the lock switch twice to prevent emergency entrance code working). Can't have been mixup confused about a mess he had got in, plenty of time to A) get up and open the door, B) call the ground.
Read this non suicide post by PACE far more fitting with the events.
http://www.pprune.org/rumours-news/5...ml#post8919354