Make a Player Die on Collision { Urgent }

So basically Me and a few friends have been working on a Unity 3D project. We are nearing the End of our due date and we desperately need a direction to head in. Our game is a simple 3d game in which you ( Player ) are standing on a Platform in water. Straight ahead, We have cubes Spawning Constantly. There is only one problem that we have. We need to make a Script to attach to the Cubes so that when they touch the player ( The player fails to Dodge the cube ) They die on collision with the cube. We do not expect any scripts to be made for us but just a direction we can head in to get us going. Thanks guys and I hope to hear from you soon as this is Urgent