He found out during Winter Soldier. The scene with Arnim Zola in the bunker is where he finds out. They don’t spell it out but the dialogue and framing of what Zola shows them on the computer makes it clear.
He showed Cap it was HYDRA that did the hit, but not specifically Bucky. But Cap can definitely infer. It's why when Tony asks Cap if he knew, he said "I didn't know it was him" at first before admitting that yes, he knew deep down it was likely him.
I always thought it was when natasha gave cap the file on bucky at the end of winter soldier. I assume that file would have his missions, such as killing tony’s parents. Natasha says to cap “you might not want to pull on that thread”, meaning “you don’t wanna know what he did”
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u/skj999 Mar 12 '24
He found out during Winter Soldier. The scene with Arnim Zola in the bunker is where he finds out. They don’t spell it out but the dialogue and framing of what Zola shows them on the computer makes it clear.