Lifes draining multiple times.

So I'm trying to make the player's lives go down by one when he gets killed but it takes 3 lives instead of just one. Here is the code when the player gets killed

 function Update () {
 
 if(playerHealth <= 0 && !isDead) {
   playerHealth = 0;
    levelManager.RespawnPlayer();
    lifeSystem.TakeLife();
 isDead = true;
  // player.GetComponent(PlayerMove).doDeathAnimation = true;
  //player.GetComponent(Rigidbody2D).isKinematic = true;
 
 }
 
 //other code here
 
 }

here is the function it calls to drain lives

 function TakeLife() {
 lifeCounter --;
 
 print(lifeCounter);
 }

Why is it taking lives multiple times!?