Mangione is subject to two distinct criminal proceedings: one at the federal level and another in a New York state court.
Although he admitted guilt in the federal case, he continues to face eight state‑level charges, among them a second‑degree murder allegation.
He has entered a not‑guilty plea to all eight state charges, and his trial is set to commence on September 8.
On Friday, outside the courthouse, his attorneys contended that because he has already pleaded guilty to the federal charges, the state prosecution is barred by the double‑jeopardy prohibition, which shields a person from being tried twice for the same offense.
Mitchell Epner, a lawyer and former federal prosecutor, remarked: “If a federal prosecution has been concluded on a particular matter, the state is precluded from pursuing that same issue.”
The New York state constitution likewise forbids double jeopardy, a provision that may influence the forthcoming trial of Mangione.
Mangione’s counsel, Karen Friedman Agnifilo, noted that they have already submitted a motion seeking dismissal of the state charges.
She further stated that Mangione has accepted “full responsibility” for Thompson’s death.
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