Another way to do this is to create a sprite and call it "KillTile" (or whatever you want) then set its properties to invisible. When it is set to invisible, it doesn't render in game (i.e. no one can see it) but it still acts like an object all the same with collision events and what not.
Drag the tile on the places on the tile map that are supposed to kill the player. Then add a Payer Event > On Collision With Another Object > KillTile
Then do your killing in the action.