Former Iron Man comics scribe Bob Layton seems to think Avengers 4 will be Robert Downey Jr.’s last ride as Iron Man.

In an interview with the Tampa Bay Times, the veteran Marvel and DC Comics writer talked about the character of Tony Stark, both on the page and off, calling him “one of the most interesting characters in the comic book world.”

Later in the conversation, he offered his opinion on what might happen to the MCU’s versions of Stark and Iron Man after Avengers 4.

“I am only speculating,” he said, “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.”

When asked if he thinks Stark dies, Layton answered with: “That is one way of doing it, but I’d only be guessing. I know this — I wouldn’t want to recast Tony Stark. Who would want to try to top Downey? But, if Tony doesn’t come back, they can put somebody else in the armor and start a new generation of Iron Man.”

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A writer for Marvel and DC during the 1970s and ‘80s, and the co-founder of Valiant Comics in 1989, Bob Layton co-penned the infamous “Demon in a Bottle” alcoholism arc of Iron Man and created the character of Ghost, who can be seen in Ant-Man and the Wasp, now in theaters. Layton is currently working to bring Valiant character Bloodshot to the big screen.