Instagram/Jon Favreau & Robert Down Movie Explore the emotional impact of Iron Man's death in Avengers: Endgame and Jon Favreau's surprising original concerns about killing off Tony Stark. April 25, 2026 AceShowbiz - The Marvel Cinematic Universe (MCU) has delivered countless memorable moments, but few resonate as deeply as Tony Stark's ultimate sacrifice in Avengers: Endgame. Since Robert Downey Jr. first donned the iconic red-and-yellow armor in 2008, the character of Iron Man became a cornerstone of the franchise and a beloved hero worldwide.