Collider.OnTriggerExit(Collider)

Description

OnTriggerExit is called when the Collider other has stopped touching the trigger.

This message is sent to the trigger and the collider that touches the trigger. Notes: Trigger events are only sent if one of the colliders also has a rigidbody attached. Trigger events will be sent to disabled MonoBehaviours, to allow enabling Behaviours in response to collisions.

#pragma strict
function OnTriggerExit(other) {
	// Destroy everything that leaves the trigger
	Destroy(other.gameObject);
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnTriggerExit(Collider other) {
        // Destroy everything that leaves the trigger
        Destroy(other.gameObject);
    }
}