Luigi Mangione has pleaded guilty to federal criminal charges tied to the killing of UnitedHealthcare CEO Brian Thompson.

Mangione, 28, appeared in a Manhattan federal court on Friday. He was charged with two federal offences: interstate stalking resulting in death and stalking through use of interstate facilities resulting in death. He pleaded guilty to both.

Mangione had previously pleaded not guilty to those charges and has not update his plea. The state-level trial is set to begin next month.