Plea negotiations are reportedly underway between Luigi Mangione and federal prosecutors over charges related to the killing of UnitedHealthcare CEO Brian Thompson.

A federal hearing has been scheduled for Friday, though sources caution that the talks are ongoing and may not result in a deal.

Mangione faces separate federal and state cases and has pleaded not guilty to the charges against him.

A federal plea could potentially affect the state prosecution because of double-jeopardy protections, making the outcome of negotiations especially significant, CNN has reported.

Mangione’s state trial is scheduled to begin with jury selection on September 8, while his federal trial is set for January.