Source, in full
Louis Leterrier: Not a lot. He almost dies in our movie, right? He’s kind of a weak bastard, you know? I think his weak thing is that he’s got to big of a heart so I think his demise actually in the comic book that’s it’s his heart. He’s too kind. He’s too nice of a superhero, so that’s the downfall of all superheroes. Their feelings bring them down, that’s all.
Notes from Wikiquote
As quoted in Steve 'Frosty' Weintraub, "Director Louis Leterrier Interview – THE INCREDIBLE HULK", Collider, June 16 2008