Oh, no. Another suicidal/homicidal pilot? After EgyptAir 990 and MH 370? At this point I'd rather take my chances with a fully computer-controlled aircraft!
Do the pilots normally have a code they use the open the door from the cabin, but in this case it didn't work or was disabled? Or does somebody have to open the door from inside the cockpit while in flight?
Could the pilot flying have had a heart attack or something while the other pilot was in the bathroom?
WHOOPS! Already answered by the time I posted!
RIP all involved....