Originally Posted by henzINNIT
Hawkeye is the most likely, but I don't think anyone is going to bite it in Avengers 2.
I bet Joss is seriously considering killing Iron Man in the third though, doing what should have happened with Han Solo in Jedi.
Tony Stark uses a modified version of extremis to gain his technopathic abilities. In the final battle with Ultron he tries to mentally hacks Ultron to temporarily disable him. Ultron back hacks him and corrupts his mind sending him into a coma. The team takes that moment to destroy Ultron. At the end of the movie we are left with a near brain dead Tony. All they have to do is do a reboot his brain story line sub plot to bring him back later in a future Captain America movie.