Disable a target after trigger exit?

So I’m making a very simple zombie AI were if a player gets close enough it sets the player as its target it follows but I dont want it to follow the player for ever, I want it to stop follow the player when he exit the trigger, how can I do that?

Some Code:

var Target : Transform;

function OnTriggerEnter(other : Collider){
	if(other.gameObject.tag == "Player"){
		Target = other.gameObject.transform;
	}
}

function OnTriggerExit(other : Collider){
	if(other.gameObject.tag == "Player"){
		//???
	}
}

probably

Target = gameObject.transform;

will work for you