Luigi Mangione, who is accused of killing Brian Thompson in New York, could face additional charges, according to Manhattan District Attorney Alvin Bragg.

Luigi Mangione is charged with murder in the Dec. 4 fatal shooting of UnitedHealthcare CEO Brian Thompson.

The ghost gun allegedly in Luigi Mangione's possession when he was arrested has been matched to three shell casings recovered at the crime scene in New York.

Video captured the moment the gunman walked up behind the CEO outside the Hilton in Midtown Manhattan, pointed his gun at him and fired.

Before he was arrested Luigi Mangione walked into the Horseshoe Curve Lodge in Altoona, Pennsylvania, one morning looking for a room, according to the desk clerk.

Luigi Mangione appeared to frequently discuss what he claimed were his health troubles -- including back pain, brain fog, and sciatica -- online.

Luigi Mangione yelled to the press about "an insult to the intelligence of the American people" as he was physically dragged into a Pennsylvania courthouse.

The bulletin warned that Thompson's killing may be used as "messaging and propaganda" to share the techniques and tactics for targeting other health care companies.

Luigi Mangione may have found inspiration in Ted Kaczynski, police intel says.

The firearm found on the suspect in the murder of the UnitedHealthcare CEO is believed to have been an untraceable ghost gun, according to police.

Luigi Mangione was taken into custody in Pennsylvania on Monday following a dayslong manhunt for the suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson.

The man charged with murder for gunning down UnitedHealthcare CEO Brian Thompson was arrested and charged after the shooting outside a Hilton Hotel in Midtown Manhattan.

The NYPD filed second-degree murder charges against Luigi Mangione, the suspected shooter of UnitedHealthcare CEO Brian Thompson, according to an online court docket.

The suspect charged in the fatal shooting of UnitedHealthcare CEO Brian Thompson was arrested in Altoona, Pennsylvania.

Luigi Mangione, who was arrested in Altoona, Pennsylvania, is a suspect in the murder of UnitedHealthcare CEO Brian Thompson, police said.

The manhunt for the suspect who killed UnitedHealthcare CEO Brian Thompson has now entered its fourth day as authorities learn more about his movements before the attack.

NYPD detectives arrived in Atlanta on Saturday as they probed leads in the shooting of UnitedHealthcare CEO Brian Thompson in New York.

Fury, anger and resentment toward the health care industry have exploded in the public rhetoric in the wake of United Health Care CEO Brian Thompson's murder.

The unidentified man suspected of gunning down UnitedHealthcare CEO Brian Thompson outside a Midtown Manhattan hotel remains at large after Wednesday's attack.

Police appear to be closing in on an identity of the man suspected of gunning down UnitedHealthcare CEO Brian Thompson in Midtown Manhattan.

The targeted killing of UnitedHealthcare CEO Brian Thompson has sparked worry in C-suites across the nation.

UnitedHealthcare CEO Brian Thompson was shot near a Midtown Manhattan hotel in a potentially targeted shooting early Wednesday, according to police.

Thompson was shot and killed on Wednesday, police say.