[msbae]

Trent Roman wrote:

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Uh, Iron Man didn't kill Captain America.

It was Sharon Carter, acting out post-hypnotic commands left by Dr. Faustus at the behest of Cap's old nemesis, Red Skull, who delivered the fatal blows (after he had already been wounded by Crossbones, also in Red Skull's employ)

Fictitiously yours, Trent Roman

I was told something different by a comic-loving former friend. I haven't seen the issue myself. It did seem kinda weird that another one of the Avengers would kill Captain America, though.