HOW DO I CAUSE COLLISION DEATH BETWEEN TWO SPRITES IN P2 PHYSICS

[DinoMode]

I made a tilemap but phaser only let me check for collions between one tile layer. I want a second tile layer that has spikes and kills the player. I don't know how to kill the player because there is no docs on this.

[icp]

http://phaser.io/examples/v2/p2-physics/collision-groups