Reload Level button at death screen

Hi im working on a little 2D-Platformer and made a deathscreen on which the Player gets when he collides with an enemy. The only Problem i have now is that the restart button wont reload the current Level. Pls help me im tried almosst everything now. here my script for enemies :

 using UnityEngine;
 using System.Collections;
 using UnityEngine.SceneManagement;
 
 public class CollisionDeath : MonoBehaviour {
 
   public GameObject DeathScreen;
   public GameObject thePlayer;
   public GameObject Spikes;
   private bool deathScreen;
   public string LevelToLoad;
   // Use this for initialization
   void Start () {
     DeathScreen.gameObject.SetActive(false);
     }
   void OnCollisionEnter2D(Collision2D other)
   {
     if (other.gameObject.name == "Mario")
     {
       Debug.Log("wawawa");
       thePlayer = other.gameObject;
       other.gameObject.SetActive(false);
       DeathScreen.gameObject.SetActive(true);
       SceneManager.LoadScene(LevelToLoad); //Application.LoadLevel("DeathScreen");
       Time.timeScale = 0f;
       thePlayer.gameObject.SetActive(true);
     }
   }
 }
 

and the script for the deathscreen:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.SceneManagement;
 
 public class DeathScreen : MonoBehaviour
 {
   public string Restart;
   public void restartGame ()
   {
     Debug.Log("restart1");
     Time.timeScale = 1f;
     Debug.Log("restart");
     int scene = SceneManager.GetActiveScene().buildIndex;
     SceneManager.LoadScene(scene, LoadSceneMode.Single);
   }
 }
 

I also set an onlick() on my button that goes to the function DeathScreen.restartGame (:/)