Take another look @ the origins of the villain 'Crossbones', played by Frank Grillo in "Captain America: The Winter Soldier", based on the Marvel Comics' character.
"...when a vicious criminal known as 'Crossbones' emerges, Cap joins up with old ally 'Natasha Romanoff', aka 'Black Widow' and new ally 'Sam Wilson' in an attempt to take down the evil mastermind.
The Crossbones character was created by writer Mark Gruenwald and illustrator Kieron Dwyer, appearing in "Captain America" #359-360 (1989), as a henchman of the 'Red Skull'. In the comics, he carried out the assassination of Captain America, although 'Sharon Carter', who was under hypnosis at the time, is believed to have fired the fatal shots.
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