A man died after falling off an observation platform at the Fire Island Lighthouse, according to the Suffolk County Police Homicide Squad.
They say the man fell just before 2 p.m.
Police say the man was seen on video walking into the lighthouse by himself, buying a ticket to the top and then falling to his death.
Police believe he intentionally jumped.
The lighthouse is closed until further notice.
The man's identity has yet to be determined.