Luigi Mangione appeared in Manhattan Supreme Court on December 2, 2025, for a hearing on the destruction of evidence in the murder case of United Healthcare CEO Brian Thompson.
Meaning of Curtis | via Reuters
A Minnesota man was arrested Wednesday night at a New York federal prison claiming to be an FBI agent and claiming he had a court order from a judge to release Luigi Mangione, who is facing murder charges. united healthcare CEO Brian Thompson made the disclosure Thursday in a new criminal complaint.
Prosecutors said the man, 36-year-old Mankato resident Mark Anderson, presented his Minnesota driver’s license when asked for identification by prison staff at the Metropolitan Detention Center in Brooklyn. Mangione is being held at that jail without bail.
Anderson also allegedly stated that he had a weapon in his bag.
The bag contained a barbecue fork and a circular steel knife resembling a pizza cutter, according to a criminal complaint filed by the U.S. Attorney’s Office in Brooklyn.
“Anderson also showed and threw numerous documents at the BOP officers,” the FBI agent who signed the complaint wrote.
“I have reviewed those documents and they appear to be related to the filing of claims with the U.S. Department of Justice,” the agent wrote.
A barbecue fork, a driver’s license, and a circular steel blade allegedly belonging to Mark Anderson of Mankato, Minnesota, who was taken into custody at New York’s Metropolitan Detention Center on January 28, 2026, on suspicion of impersonating an FBI agent.
United States District Court for the Eastern District of New York
Anderson is charged with impersonating an FBI agent and is scheduled to be arraigned Thursday afternoon in federal court in Brooklyn.
The complaint does not specify the names of the inmates Anderson allegedly wanted released. However, law enforcement officials confirmed it was Mangione, 27.
The person said Anderson traveled to New York City in search of job opportunities but was unsuccessful, and was working at a pizzeria.
His arrest came hours after state prosecutors in Manhattan Supreme Court urged the judge to set Mangione’s murder trial for July.
That was two months before jury selection began in the case in Manhattan federal court. In the case, a University of Pennsylvania graduate is charged with multiple charges in connection with the killing of Thompson, a Minnesota resident who worked for the nation’s largest private health insurance company.
Prosecutors alleged that Mangione stalked and then shot and killed Thompson on the morning of Dec. 4, 2024, as he walked into a midtown Manhattan hotel to attend an investor event by UnitedHealthcare’s parent company, UnitedHealth Group.
Mangione was arrested five days after the murder at a McDonald’s in Altoona, Pennsylvania.
He has pleaded not guilty in both cases.
Federal prosecutors are seeking the death penalty if Mangione is convicted. The judge in the case could rule this week on whether Mr. Mangione faces the death penalty.
