The brazen killing of UnitedHealthcare’s CEO was likely carried out with a ghost gun, one of the nearly untraceable weapons that can be made a home, police said Monday. A ghost gun is a firearm without a serial number,

The FBI announced late Friday that it was offering a $50,000 reward for information leading to an arrest and conviction, adding to a reward of up to $10,000 that the NYPD has offered.

UnitedHealth CEO Brian Thompson, 50, was killed last Wednesday in what police said was a “brazen, targeted” attack as he walked alone to the Hilton from a nearby hotel, where UnitedHealthcare’s parent company, UnitedHealth Group, was holding its annual investor conference, police said.

Police arrested a “strong person of interest” Monday in the brazen Manhattan killing of UnitedHealthcare’s CEO after a quick-thinking McDonald’s employee in Pennsylvania alerted authorities to a customer who was found with a weapon and writings linking him to the ambush.

The man accused of killing UnitedHealthcare’s CEO struggled with deputies and shouted while being led into court Tuesday as new details emerged about his possible motivation behind the ambush. In his first public words since a five-day search ended with his arrest at a McDonald's in Pennsylvania,

The person of interest in UnitedHealthcare CEO Brian Thompson’s killing has been identified as a 26-year-old computer whiz who graduated as valedictorian from his Maryland prep school. Luigi Mangione,

A man suspected in the brazen Manhattan killing of UnitedHealthcare’s CEO was arrested and charged with murder Monday after a quick-thinking McDonald’s customer in Pennsylvania recognized him from a surveillance photo and police officers found a gun,

The gun found on the suspect in the killing of UnitedHealthcare CEO Brian Thompson matches shell casings found at the crime scene in New York City, police said.