The chopper was said to be “flying erratically” before it crash landed on the AXA Equitable Center building on 7th Avenue, which is close to the Empire State Building and Times Square.
It had also been flying within restricted airspace, where aircraft are forbidden from flying below 3,000 feet (914 metres) within a one-mile radius of Trump Tower.
The tower is just a few blocks from the site of the crash.
Authorities say the helicopter had taken off from a pad on Manhattan’s east side at 1:32pm local time, and had crashed on the skyscraper just 11 minutes later.
It is not currently clear whether the pilot had been in touch with air traffic control at La Guardia Airport, or with another tower.
New York Mayor Bill De Blasio said there was no indication that the crash was an “act of terrorism”, and said the person who died was believed to be the pilot.
(c) Sky News 2019: One dead after helicopter crashes on to Manhattan skyscraper