Damage Reciever Won't Destroy Object

My damage reciever, when the hitpoints run out, instantiates an explosion and a dead replacement, but the original object doesn't destroy itself. Here's the script:

 var hitPoints = 100.0; 
 var detonationDelay = 0.0; 
 var explosion : GameObject; 
 var deadReplacement : Rigidbody; 
 
 function ApplyDamage (damage : float) { // We already have less than 0 hitpoints, maybe we got killed already? if (hitPoints <= 0.0) return;
 
 hitPoints -= damage;
 if (hitPoints <= 0.0) {
     // Start emitting particles
     var emitter : ParticleEmitter = GetComponentInChildren(ParticleEmitter);
     if (emitter)
         emitter.emit = true;
 
     Invoke("DelayedDetonate", detonationDelay);
 }
 }
 
 function DelayedDetonate () { BroadcastMessage ("Detonate"); }
 
 function Detonate () { // Destroy ourselves Destroy(gameObject);
 
 // Create the explosion
 if (explosion)
     Instantiate (explosion, transform.position, transform.rotation);
 
 // If we have a dead barrel then replace ourselves with it!
 if (deadReplacement) {
     var dead : Rigidbody = Instantiate(deadReplacement, transform.position, transform.rotation);
 
     // For better effect we assign the same velocity to the exploded barrel
     dead.rigidbody.velocity = rigidbody.velocity;
     dead.angularVelocity = rigidbody.angularVelocity;
 }
 
 // If there is a particle emitter stop emitting and detach so it doesnt get destroyed
 // right away
 var emitter : ParticleEmitter = GetComponentInChildren(ParticleEmitter);
 if (emitter) {
     emitter.emit = false;
     emitter.transform.parent = null;
 }
 }
 
 // We require the barrel to be a rigidbody, so that it can do nice physics @script RequireComponent (Rigidbody)
 
  

How do I make it so the object is destroyed when the hitpoints run out? Thanks in advance.