You probably should have taken the pictures of it in your tank.
Yes it does look like a gonner to me. I agree with wall Euphyllia they are very prone to brown jelly mostly on the ones that have been fragged IME. I recently got a full wall hammer so we'll see how it goes. I only got it because it was the full wall hammer, never been fragged. I will never buy another wall that has been fragged, as far as the full colony, we'll see how it goes.