How to call methods from other scripts.

I’m currently making a simple game for educational purposes and have stumbled across a problem. I’ve made a method called Kill() in a script called Player.cs and I now want to call this function from a script called KillTrigger.cs. So how would I do this? I’ve tried to make the method static but that wont let me call GetComponent. I’ve also tried to create another copy of Player.cs inside KillTrigger.cs by doing Player ply = new Player();. But that forced my to add GameObject.Find() infront of GetComponent, inside of Player.cs (Which I’ve heard takes long time to perform).

Player.cs

    public void Kill()
    {
        GetComponent<Rigidbody2D>().velocity = new Vector2(0f, -6.5f);
        Alive = false;
    }

KillTrigger.cs

using UnityEngine;
using System.Collections;

public class KillTrigger : MonoBehaviour {

    private void OnTriggerEnter2D(Collider2D collision)
    {
    //KillPlayerHere
    }
}

declare your player script as a variable in killTrigger.cs like public Player player. then simply drag Player.cs script inside the properties of killTrigger.cs.
You can call that function simply by saying player.Kill(); inside KillTrigger. or you can use a getcomponent call if they are on the same Game Object.