Supporters of Luigi Mangione are raising tens of thousands of dollars for his defense fund.

Luigi Mangione's mother filed a missing persons report about her son in San Francisco 16 days before he allegedly shot dead UnitedHealthcare CEO Brian Thompson.

Luigi Mangione -- the alleged killer of UnitedHealthcare CEO Brian Thompson -- has been greeted by a surge of enthusiastic online support.

Mangione’s mother had filed a missing persons report about her son on Nov. 18.

Luigi Mangione may waive extradition to New York City as early as Tuesday, Manhattan District Attorney Alvin Bragg said on Friday.

The day after a masked gunman killed the CEO of UnitedHealthcare in New York City, police in San Francisco gave the FBI a potentially valuable tip about the identity of the suspect

Luigi Mangione has been charged with second-degree murder in the killing 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 firearm found on the suspect in the murder of the UnitedHealthcare CEO is believed to have been an untraceable ghost gun, according to police.

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.

"Wanted" signs naming executives were posted in Manhattan this week, NYPD said.

Luigi Mangione was charged in Pennsylvania with carrying a gun without a license, forgery, falsely identifying himself to police and possessing "instruments of crime."

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

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

The murder of UnitedHealthcare CEO Brian Thompson, combined with the alleged grievances of the man suspected of shooting him, have put health care in the spotlight.

A week after UnitedHealthcare CEO Brian Thompson was shot and killed in New York, the health insurer's parent company is praising him as "one of the good guys."

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.

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

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

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.