Manhattan prosecutors have signaled they may contest a potential federal plea deal for Luigi Mangione, the accused killer of UnitedHealthcare CEO Brian Thompson, if it interferes with his upcoming New York murder trial. The Manhattan District Attorney's Office stated in a court filing that it could inform the federal court of the consequences if a federal guilty plea were to undermine the state's prosecution.
Assistant District Attorney Joel Seidemann wrote in a July 2 letter that the office would advise the federal district court of such a consequence and that the court should consider it before accepting any plea. The prosecutors also noted that any opposition from Thompson's family should be considered. This stance represents a clear indication that Manhattan prosecutors are prepared to push back against any agreement that could prevent the state's murder case from proceeding to a jury.
The dispute arises amidst reports from June indicating that Mangione's legal team and federal prosecutors had discussed a potential plea deal, though no agreement was reached. Mangione's attorney, Karen Friedman Agnifilo, previously criticized information attributed to anonymous sources, calling it a "deliberate pattern by prosecutors and law enforcement to prejudice Luigi."
Mangione, 28, has pleaded not guilty to charges in both the state and federal cases stemming from the December 2024 killing of Thompson, who was shot outside a Manhattan hotel. His federal trial, initially set to begin sooner, was postponed by U.S. District Judge Margaret Garnett to January 2027. This rescheduling aims to allow Mangione's New York murder trial, which is currently on track to commence on September 8, to proceed first.
During a June 29 hearing, Judge Garnett explained that it was "impossible" to manage jury selection for the federal case while the defendant and his counsel were occupied with the state trial. Federal jury selection is now scheduled to begin in January 2027, with opening statements anticipated later that month.
Manhattan prosecutors also contend that New York should have the primary opportunity to prosecute Mangione, citing his extradition to the state for the murder case before his transfer to federal custody. They argue that this transfer does not diminish New York's priority in prosecuting the homicide.
Mangione was arrested in Altoona, Pennsylvania, five days after the shooting. His defense team has previously criticized reports of plea negotiations, asserting they are part of a strategy to manipulate public opinion and infringe upon his right to a fair trial. The defense has also withdrawn an emotional distress claim in the state murder case, which could have potentially reduced the charge to manslaughter.