GuiText not updating

I'm having trouble getting my score counter show up properly on screen. I am trying to use GuiText and I have it tied into a score script. I want it to update when the Player kills an Enemy. I can tell by the console that the score variable is incrimenting properly, but the GuiText is not updating.

Here are the two scripts:

JumpDeath.cs

 using UnityEngine;
 using System.Collections;
 
 public class JumpDeath : MonoBehaviour {
     public GameObject deathInstance = null;
     public Vector2 deathInstanceOffset = new Vector2(0,0);
     public Score scoreScript;
 
     void OnTriggerEnter2D (Collider2D other)
     {
         if (other.gameObject.tag == "Player") 
         {
             OnKill();
         }
     }
     
 
 
     void OnKill()
     {
         if (deathInstance) {
             var pos = gameObject.transform.position;
             GameObject clone = Instantiate (deathInstance, 
                                             new Vector3 (pos.x + deathInstanceOffset.x, 
                          pos.y + deathInstanceOffset.y, 
                          pos.z), Quaternion.identity) as GameObject;
 
             scoreScript.AddScore();
         }
         print (scoreScript.score.ToString ());
         Destroy(gameObject);
     }
 
 }

Score.cs

 using UnityEngine;
 using System.Collections;
 
 public class Score : MonoBehaviour {
     public int score;
 
 
     // Use this for initialization
     public void Start () {
 
 
     }
 
     public void AddScore(){
         score += 1;
 
     }
 
     // Update is called once per frame
     void Update () {
         guiText.text = score.ToString();
     }
     
 }