As an expert in the Marvel Universe, I can provide an analysis of the events surrounding the death of Tony Stark's parents, Howard and Maria Stark, within the context of the comics and the Marvel Cinematic Universe (MCU).

In the comics, Howard Stark's death is often depicted as a result of a car accident, which was later revealed to be orchestrated by the Winter Soldier, a brainwashed Bucky Barnes. Maria Stark's death is not as prominently featured in the comics.

However, in the MCU, specifically in the film "Captain America: Civil War," it is revealed that Howard and Maria Stark were killed in a car crash that was not an accident. The crash was orchestrated by the Winter Soldier, who was at the time a brainwashed assassin working for HYDRA. This revelation causes a rift between Tony Stark (Iron Man) and Steve Rogers (Captain America), as Steve is close to Bucky and tries to protect him from Tony's wrath.

Here is the response with the required format:

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So clearly, he's no friend of Hydra. However, when the Winter Soldier was sent on the mission where he ended up killing the Starks, it wasn't supposed to be an assassination. ... So really, the reason why Bucky killed Tony Stark's parents is because Hydra wanted to recreate Captain America on a large scale.read more >>