Know if there is Collisions on my boxCollider

Hi all,

I would like to know if there is a collision on my boxCollider.

I send an object on a gameObject (zombie) and i would like to know when my object enter in collision. When it collides, i would like to destroy my gameObject (zombie)

Here is my script

 using UnityEngine;
 using System.Collections;
 
 public class zombie : MonoBehaviour {
 
     BoxCollider boxCollider;
 
     // Use this for initialization
     void Start () {
         boxCollider = GetComponent <BoxCollider> ();
     }
 
     // Update is called once per frame
     void Update () {
         if (boxCollider.isTrigger == true) {
             Destroy(this);
         }
     }
 }

I have a rigidbody too on my zombie

Thank you for your help