Don't look if you don't want to see it. It is big.
[spoiler]Steve dies. Buckey becomes the next Captain America[/spoiler]
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Anyone to read the comics knows that. In the aftermath of Civil War, Captain America is taken into S.H.I.E.L.D. custody where he is assassinated per the order of the Red Skull. Crossbones snipes at him while Sharon Carter, who has been brainwashed by Doctor Faustus posing as a S.H.I.E.L.D. psychiatrist, delivers the killing blow.