Issue regarding triggers?

using UnityEngine; using System.Collections;

public class manwalk : MonoBehaviour {

 float walkSpeed = 90f;
 float forwardSpeed = 0.5f;    
 bool didwalk =false;
 Animator animator;
 bool dead  =  false;
 
 
 // Use this for initialization
 void Start () {
     animator = transform.GetComponentInChildren<Animator>();
     
     if(animator == null){
         Debug.LogError("Didn't find the animator");
     }
     
 }
 //Do grphics here
 void Update () {
     if (Input.GetKeyDown(KeyCode.Space) || Input.GetMouseButtonDown(0)){
         didwalk =true;
     }
 }
 
 // do physics here
 void FixedUpdate () {
     if(dead)
         return;
     
     rigidbody2D.AddForce(Vector2.right * forwardSpeed);
     if(didwalk ){
         rigidbody2D.AddForce(Vector2.up * walkSpeed);
         animator.SetTrigger("Dowalk");
         didwalk  =false;
     }


 }
 void OnCollisionEnter2D(Collision2D collision){
     animator.SetTrigger("Death");
     dead = true;
 }

}

I am updating my script thanks to @Graham Dunnett for pin pointing the mistake. thanks a lot sir.