How do I make a death trigger work without the player having collision enabled??

I'm racking my brains every which way for this to work, pls help!

You want to detect a collision without a collision? Any reason you can’t enable the collision?

Well, for the player to fall off the map and return to the checkpoint.

He needs to disable collisions in order to cross the ground.

You can use the inverted "is on screen" condition to trigger whatever you need to trigger after the character falls out of the map.