BROOKLYN — A man was found dead on a G train platform in Greenpoint early Friday morning, NYPD officials said.

The man, who remains unidentified but is believed to be in his 40s, was found unconscious about 1:54 a.m. on the southbound platform of the Nassau Avenue station, police said.

The man, who police believe was homeless, showed no signs of injuries, but was pronounced dead at Woodhull Hospital, police said.

It wasn't immediately clear how he died, but investigators believe it may have been an accident, police said.