**Iron Man** writer Bob Layton expects **Avengers 4** to be the end of Iron Man.
“I am only speculating, but I will guess that [Robert Downey Jr.] is done. He has been doing the same role for over 10 years now, and I think as with any actor sometimes, it is time to move on.” Bob Layton
Layton says he believes Stark will be killed, rather than replaced with a different actor.
"I know this — I wouldn’t want to recast Tony Stark.