Police arrested Luigi Mangione, 26, the person of interest in the Dec. 4 NYC shooting, in Pennsylvania The suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson may have used a ...

For decades, America's detectives have made breakthroughs in crime using gun traces. A homicide investigator typically uses ballistics and serial numbers of weapons checked via a vast network of gun ...

Luigi Mangione, who has been charged with murder in the shooting death of UnitedHealthcare CEO Brian Thompson, apparently had a ghost gun, a type of firearm that can be made at home, police said ...