Question

why iron man died in endgame ?​

Answer 1

Answer:

Several of the original Avengers die in their mission to bring back their disappeared fellow heroes. Here's everyone who is dead — like, really dead — alive, and resurrected at the end of Avengers: Endgame. Still from 'Avengers: Endgame' featuring Tony Stark/Iron Man (Robert Downey Jr.).

Answer 2

Answer:

The gamma rays produced by infinity stones

Explanation:

The snap led to the release of an subtastial amount of gamma rays which internally damaged his body very quickly as he was very close to it!