Unable to use Functions from another script [C#] READ THRU MANY Q&As but STILL not working

HELP! Even though I read through many many Q&As of similar nature, I still can't solve my own problem. According to my debug log, only "YOU DEAD!" popped up and not "cuteCube is DEAD!" which means my Player.Control function which I call from another script - cuteCube is not working.

 public class lightningKills : MonoBehaviour {  
 
     private Collision2D c;
     public float howHeavy;
     public bool isDestroyed;  
 
     void Start()
     {
         howHeavy = GetComponent<Rigidbody2D>().mass;
     }
 
     void OnCollisionEnter2D(Collision2D c)
     {
         switch(c.gameObject.tag)  
          {
             case "Player":
                 Debug.Log("YOU DEAD!");
                 cuteCube PlayerControl = gameObject.GetComponent<cuteCube>();
                 //Kills the Player!
                 PlayerControl.Death();
                 Destroy(gameObject);
                 isDestroyed = true;
                 Debug.Log("cubeCube is DEAD!");
                 break;  
 
             case "Background":
                 if (gameObject.name == "lightning(Clone)")
                 {
                     Destroy(gameObject);
                     isDestroyed = true;
                     Debug.Log("Destroyed!");
                 }               
                 break;  
 
             default:
                 Destroy(gameObject);
                 if (gameObject.name == "lightning(Clone)")
                 {
                     Destroy(gameObject);
                     isDestroyed = true;
                     Debug.Log("Destroyed!");
                 }
                 break;  
           }
     }  
 }

This is the script that I want to reference to (focus on the Death() function):

 using UnityEngine;
 using System.Collections;
 using System;
 
 public class cuteCube : MonoBehaviour
 {
     
     private bool facingRight = true;
     private Transform groundCheck;
     private Animator anim;
     public Collision2D col;
     private float straight;
     private ConstantForce2D pushIt;
     public BoxCollider2D fallThrough;
     public float dyingJump = 200f;
     private Rigidbody2D box;
     public GameObject restartGameUI;
     private bool isShowing;
 
     void Start()
     {
         // Setting up references.
         groundCheck = transform.Find("groundCheck");
         isShowing = false;
         anim = GetComponent<Animator>();
         fallThrough.isTrigger = false;
         move();
         restartMenu();
      }
 
     void FixedUpdate()
     {
 
         checkClickInput(); 
      // checkTouchInput();
 
     }
 
     void Flip()
     {
         // Switch the way the player is labelled as facing.
         facingRight = !facingRight;        
         Debug.Log("HITTING THE WALL, I'M GOING TO FLIP NOW!");
 
         //Make the cuteCube go in opposite direction.
         pushIt.force = -pushIt.force;
         move();
     }
 
     void move()
     {
         //Giving the cuteCube a constant force for it to automatically move.
         pushIt = GetComponent<ConstantForce2D>();
        
     }
 
     /* void checkTouchInput()
         {
             if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
             {
               RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint((Input.GetTouch(0).position)), Vector2.zero);
                 if (hit != null)
             {
                 Flip();
                 Debug.Log("Touched it");
             }
         }
 
     }   
    */
 
     void checkClickInput()
     {
         Vector3 pos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
         RaycastHit2D hit = Physics2D.Raycast(pos, Vector2.zero);
 
         if (Input.GetMouseButtonDown(0))
         {
             if (hit != null)
             {
                 Flip();
                 Debug.Log("I'm hitting " + hit.collider.name);
             }
         }
     }
 
     //Detecting collision with the wall.
     void OnCollisionEnter2D(Collision2D col)
     {
         if (col.gameObject.tag == "Walls" )
         {
             Flip();            
         }
     }
 
     public void Death()
     {
         pushIt.enabled = false;
         GetComponent<Rigidbody2D>().AddForce(new Vector2(0f, dyingJump));
         fallThrough.isTrigger = true;
         Dead();
      }
 
     void restartMenu()
     {
         restartGameUI.SetActive(isShowing);
     }
 
     void Dead()
     {
         isShowing = true;
         restartMenu();
     }
 }