Luigi Mangione’s attorneys discussed with prosecutors the possibility of a plea deal in his federal case connected to the December 2024 killing of UnitedHealthcare’s chief executive, according to a source familiar with the discussions who spoke on the condition of anonymity because the case is ongoing.

The discussions, which are not unusual in any serious federal case, did not result in an agreement, the source said.

Mangione is due to appear in federal court on Monday. Parties were expected to discuss juror questionnaires and jury selection. It is unlikely any discussions of a plea will come up.

The 28-year-old, who is subject to prosecutions in both federal and state courts, has pleaded not guilty to all charges. In the federal case, he faces two stalking charges, with prosecutors arguing he stalked UnitedHealthcare CEO Brian Thompson online and traveled across state lines to carry out the killing.

The charges carry a maximum possible sentence of life in prison without parole.