Luigi Mangione's pretrial hearing concludes as judge says he'll issue ruling on evidence in May

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.