The 26-year-old has previously denied the murder charges brought against him at the state level, a process that is ongoing in parallel with the federal indictment.
The prosecution has stated that they will demand the death penalty. It is the first time the Justice Department has pursued a case with a demand for the death penalty since Donald Trump became president again.
One of Trump's campaign promises was to resume federal executions after they were paused by the previous president Joe Biden.
The murder of Brian Thompson outside a hotel on Manhattan at the beginning of December last year received significant attention.
Mangione managed to flee and made his way to Pennsylvania, where he was coincidentally discovered by the police and arrested at a McDonald's restaurant in the city of Altoona.
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