Police say 30-year-old Eoin Curran was training on a 23-foot sailboat, along with an instructor and two other individuals, when it reportedly listed 90 degrees due to heavy winds from a squall.
Both Curran and the instructor fell overboard; the instructor was able to get aboard the sailboat and a personal flotation device was thrown to Curran, according to reports.
Twelve searches were conducted over 21 hours, covering a 101-square nautical mile area, which included two first-light searches by a Coast Guard Air Station Atlantic City helicopter and rescue crew, officials said. Additional searches were conducted by Westchester County Sheriff and Police aircraft.
The final search was called off at 1 p.m. Monday.