Luigi Mangione attends state court hearing in New YorkA man has been arrested after allegedly posing as a federal agent to break accused killer Luigi Mangione out of his Brooklyn jail holding centre. Mark Anderson, who allegedly posed as an FBI agent, walked into the intake section of the MDC Brooklyn jail on Wednesday, January 28. It is reported that the 36-year-old tried to help accused UnitedHealthCare CEO killer, Luigi Mangione, out of prison. Police said they found a gun and a manifesto in Mangione's backpack. Mangione's attorneys have argued that the chain of custody for the evidence found in his backpack was not appropriately followed.