The NYPD is desperate to find him. Corners of the public hope they never do, and some digital sleuths that usually step up ...

New clues emerged Thursday in the hunt for the masked gunman who stalked and killed UnitedHealthcare CEO Brian Thompson, ...

As the investigation into a masked gunman who stalked and killed the head of one of the largest U.S. health insurers moves ...

Nearly four days after the shooting of UnitedHealthcare CEO Brian Thompson, police still do not know the gunman’s name or ...

New video obtained by ABC News shows UnitedHealthcare CEO Brian Thompson's killer waiting for him moments before last week's ...

Possible leads have emerged about his travel before the shooting and a message scrawled on ammunition found at the crime ...

Live updates and developments on the manhunt for the suspect in the shooting death of UnitedHealthcare CEO Brian Thompson, ...

"The shooter appears to be a light-skinned male. He's wearing a light brown or cream colored jacket, a black face mask, black ...

Luigi Mangioni, the suspect in the killing of UnitedHealthcare CEO Brian Thompson, wrote online of the “devastating” effect a chronic back condition had on him as a young man.