Item Drop Help

I made a script that should be spawning Item1 when the enemy has 0 HP, maybe im missing something because nothing happens when they die...

 using UnityEngine;
 using System.Collections;
 
 public class ItemDrop : MonoBehaviour {
     public Rigidbody Item1;
     public Rigidbody Item2;
     public Rigidbody Item3;
     public Transform monster;
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         AttackandHP ZS = (AttackandHP)monster.GetComponent ("AttackandHP");
         if (ZS.curHealth == 0) {
             Item1Spawn();
         }
     }
 
 
     public void Item1Spawn() {
         Rigidbody clone;
         clone = Instantiate(Item1, monster.transform.position, monster.transform.rotation) as Rigidbody;
     }
 
 }