Luigi Mangione’s lawyers argue that his federal guilty plea should prevent New York from pursuing the remaining murder and firearms counts in the case over UnitedHealthcare CEO Brian Thompson’s killing. A reply dated Oct. 30 supports their earlier request to dismiss Count 3, second-degree murder, and firearms Counts 4–10; it does not seek dismissal of Count 11, which concerns an allegedly fraudulent identification card.
The defense says the federal and state cases cover the same underlying conduct. Mangione pleaded guilty Aug. 14 to interstate stalking resulting in death and cyberstalking through use of interstate facilities resulting in death, the U.S. Attorney’s Office for the Southern District of New York said.
New York Criminal Procedure Law § 40.20 generally bars separate prosecutions for offenses based on the same act or criminal transaction, subject to listed exceptions. Manhattan prosecutors argue that the state and federal charges involve different legal elements and conduct, the Associated Press reported.
A state court addressed a related issue before Mangione’s federal plea. On Sept. 16, 2025, Justice Gregory Carro dismissed two terrorism-related murder counts but found the remaining charges, including second-degree murder, legally sufficient to proceed. Carro also ruled that Mangione’s earlier double-jeopardy challenge was premature because no prior prosecution had ended in a guilty plea or reached a sworn jury.
That ruling discussed the federal Constitution’s dual-sovereignty doctrine separately from New York’s statutory protections. It did not decide the current motion, which relies on the state law after Mangione’s federal plea.
The state case could affect the time Mangione serves if he is convicted, the Associated Press reported. Carro’s Aug. 17 order set Dec. 10 as the next state-court date. Federal sentencing is scheduled for Dec. 18.
