The man who killed four in a mass shooting at 345 Park Avenue bought the gun from his supervisor at a Las Vegas casino.

Sebije Nelovic, who for 27 years has cleaned the Manhattan office building that was the site of the shooting, was dusting a ...

The man who gunned down four people at a Park Avenue office building left anti-psychotic medication in his Las Vegas ...

The glittering skyscraper where hundreds work became the scene of New York City’s deadliest gun attack in 25 years when a man ...

The New York City Medical Examiner determined a cause and manner of death for the gunman who killed four people inside a ...

New York police honor fallen officer Didarul Islam with funeral services after he was killed by a gunman in a Midtown office ...

Wesley LePatner was Blackstone's head of real estate and CEO of an evergreen real estate fund. She was a victim of Monday's ...

The medical examiner confirmed that Shane Tamura died from a self-inflicted gunshot wound but hasn't yet determined a CTE ...

Employees at firms including Blackstone and KPMG hid and set up barricades during the gunman’s rampage.

The madman’s rampage reminds us that evil can strike the most secure-seeming location, even in the best of times.

An active shooter incident occurred in Midtown Manhattan, New York, officials said. Here's what to know about 345 Park Ave.