The ghost gun allegedly in Luigi Mangione's possession when he was arrested has been matched to three shell casings recovered ...

He could not confirm how he came to represent Mangione, he would only say he was retained Tuesday ahead of the suspect's extradition hearing in Pennsylvania.

Mangione has been charged with murder for the killing of UnitedHealthcare CEO Brian Thompson, a father of two, in a brazen shooting on Dec. 4 outside a Manhattan hotel before an industry conference, ...