Restarting 2D Rouge Like Game Tutorial with "R" keyboard press

How would I go about adding a “R” button press to restart the 2D Rouge Like Tutorial game once your character dies.

using UnityEngine;
using UnityEngine.SceneManagement;

    public class LoadScene : MonoBehaviour
   {

    private bool playerIsDead;

         void Update(){
            if (playerIsDead == true){
               if (Input.GetKeyDown("KeyCode.R")){
                   SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
               }
            }
        }
   }

Now you only have to set the bool playerIsDead to true if he dies.

Thank you I will certainly give that a try when I get home. Thank you for your input.