How do I make my character fall off the edge?

I've been wanting to make a role playing game but i've never been able to figure out how the character would die once he fell off the edge of the map.

Here is an example imgur.com/Y3D4fEI

The red block in the middle is the player.

Please help !!

There is a capx at the bottom if you are willing to put it on there.

dl.dropboxusercontent.com/u/100184979/Fall.capx

I would create an event like: If Player is not overlapping floor1 or floor2 = kill Player.

Understand the logic?

Oh man i didn't think of that, thanks very much!