I fly 500's, totally anal about the front lockers, once open the full loads are upon two very small alli brackets. It probably detached and either hit the screen or went through the engine.
Hatch discipline was something that was drummed into me in a big way very early on.
We never use loose keys in pockets, somehow if you attach it to elastic and hook it to one of your belt loops they always seem to get locked properly.
That said there but for the grace of god go I, especially with late pax, slots etc. RIP the crew, thoughts are with the families