Rotate head of player based on where he's looking?

I have a model of a soldier that I downloaded off the Asset Store. I want to make an FPS, but is there a simple way to rotate the player’s head based on where he’s looking? Like if the player looks up, the head rotates with the camera.

Get this one: http://unity3d.com/support/resources/unity-extensions/head-look-controller - it does decent job.