Police say David Lerner was working at the Hyatt Regency Long Island in Hauppauge around 7:30 p.m. when he fell from an upper floor window to the ground.
The 41-year-old from Holbrook was taken to Stony Brook University Hospital where he was pronounced dead.
Suffolk County Police Homicide Squad detectives and the Occupational Safety and Health Administration are investigating.
Detectives are asking anyone with information on the incident to call the Homicide Squad at 631-852-6392.
MORE NEWS: Homeowner told to take down 'Christmas Vacation' display or face fines
La Mirada homeowner's 'National Lampoon's Christmas Vacation' front yard display may lead to fines
----------
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a News Tip