Luigi Mangione is expected to plead guilty in federal court on Friday to stalking charges tied to the killing of UnitedHealthcare CEO Brian Thompson, a move that could eliminate his January federal trial while setting up a legal fight over whether New York can still proceed with a state case due to begin with jury selection on Sept. 8. State prosecutors have signaled they may ask the federal court not to accept any deal they believe would undercut the murder prosecution, and any plea is likely to prompt immediate arguments over New York's stricter double jeopardy protections. Justice Gregory Carro has already ordered an anonymous jury, a public juror questionnaire process and an overflow room for the heavily watched state trial. Mangione has pleaded not guilty in New York to charges including second-degree murder, weapons offenses and forgery. Federal murder and weapons counts were dismissed in January, ending the Justice Department's effort to seek the death penalty and leaving stalking charges at the center of the federal case.