How to make my character die

Hi, I am making a 2D sidescroller and my knowledge of javascript is a little limited. Now I am trying to make a area where the player dies if he is to fall of a platform or something like that. I set up a 2D boxcollider and I attached the following script to it:

 #pragma strict
 
 //Damage variable
 var TheDamage : int = 500;
 var Player : Rigidbody2D;
 
 function OnCollision2DEnter(hit : Collision2D)
 {
     if (hit.gameObject.name == "Player")
     {
         hit.gameObject.SendMessage("ApplyDamage", TheDamage);
     }
 }

The code for the damage and death of the character:

 #pragma strict

 var Health : float;
 
 function Update ()
 {
     if (Health <= 0)
     {
         Death ();
     }
 }
 
 function ApplyDamage (TheDamage : int)
 {
     Health -= TheDamage;
 }
 
 function Death ()
 {
     Destroy (gameObject);
     Application.LoadLevel (Application.loadedLevel);
 }

So I made the damage pretty high because the health can very in height but at all times its under 500. If the player collides with the "DeadZone" I want him to be destroyed and I want the level to reset.

Your help will be greatly appreciated.