A previous post by gbpeck or something similar has been deleted, as I'm sure
mine will, but he or she made a valid point. If contemplating suicide, would
someone rely on the other pilot going on a comfort break on a short
flight? It seems unlikely.
Your post suggests a premeditated suicide, which a lot are not. A lot of the suicides that happen at train stations around the UK - the people haven't just upped and ran to the nearest station to jump under a train - they are in their business suits with all of their items ready for their business day and have gone to the station for their commute. Something happens at that exact moment and they jump.
Although it can be premeditated, most are not, as pre-planning means some logical thought process and most suicides are illogical thought processes.