The evidence suppression hearing in the case against accused CEO killer Luigi Mangione concluded Thursday after the defense signaled it would call no witnesses.

The nine-day hearing will determine what evidence will be used against Mangione when he goes on trial on charges of gunning down UnitedHealthcare CEO Brian Thompson on a Manhattan sidewalk last year.

The defense has argued the officers violated Mangione’s constitutional rights against illegal search and seizure because they lacked a warrant when they searched his backpack after Mangione was apprehended in a Pennsylvania McDonald’s five days after the shooting.