The male fin whale was found at Smith Point County Park about 7:30 a.m. Thursday.
Thomas O’Callaghan told CBSNewYork.com he spotted a whale breaching at around 2 p.m. at Beach 128th Street in Belle Harbor.
The sei whale was taken to the Army Corps of Engineers facility in New Jersey where the Riverhead Foundation will conduct tests to determine cause of death.
Representatives from the Marine Mammal Stranding Center in Brigantine, N.J. were in Jersey City on Wednesday, conducting a necropsy on the finback that weighs 55 to 60 tons.
Marine researchers have launched an investigation into the death of second True’s beaked whale that washed ashore on eastern Long Island in as many days.
A finback whale that washed up dead on a New York beach likely was killed when it was hit by a passing ship.