Luigi Mangione has pleaded not guilty in a federal murder case in New York, where he faces charges including the murder of UnitedHealthcare CEO Brian Thompson. His defense team is seeking to dismiss at least two charges, claiming that evidence was illegally obtained and that the concurrent state and federal prosecutions violate the double jeopardy clause. Additionally, they argue that his statements were unconstitutional due to not being given his Miranda rights, while federal prosecutors intend to seek the death penalty against him.