Happy’s death was reverted last minute.
Kevin Feige revealed that Jon Favreau's Happy Hogan was originally meant to die in Iron Man 3, until Favreau himself asked the crew that they didn't.
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Jon Favreau's Happy Hogan Almost Died in Iron Man 3, Reveals Kevin Feige
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Jon Favreau should get another chance at directing an MCU project. I think Nova would be a fantastic choice. A intergalactic western with a lost & lonely space drifter who mentors a
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IRON MAN 3 Storyboard Art Reveals Happy Hogan Was Supposed to Die — GeekTyrant
Avengers': Jon Favreau begged Russos to not kill Iron Man
Happy Hogan Was Almost Killed Off in IRON MAN 3, Luckily Jon Favreau Convinced Them Not To — GeekTyrant