How to make a respawn point after falling of a map?

Hi. I’m quite new to Unity and I’m making a simple jumping game to learn the basics. The problem is that when I fall off the map, I have to restart it and go from the start. I’ve made a cube with a collider under the whole map, and I thought I could do that when the player hits it, he respawns at the latest respawn point. Anyone know how to do it?

http://answers.unity3d.com/questions/192906/Need-help-with-respawn-after-falling.html