Thank you. I was so shocked this could happen. I searched this site out of curiosity and found your post.That is tragic and chilling. I'm so sorry this happened.
In hopes of helping someone ever needing an idea of what to do should this happen to them...
Get a couple of people to help you and using long sticks or fishing poles, push them through the fence and wave them up and down. Patiently direct the bird towards the door. It may take an extra minute. But it works.