OYSTER BAY, N.Y. (PIX11) – A body was found in the water off Long Island Sunday afternoon, police said.

The body was found in the water of Oyster Bay, just west of Caumsett State Historic Park Preserve, according to the Nassau County Police Department.

The body was identified as 19-year-old Jack Koch, who fell off a 25-foot boat in Oyster Bay Harbor on May 15, Newsday reported. Koch had been sailing with a friend when he fell into the water and disappeared, police previously said, according to Newsday.

The Nassau County Medical Examiner’s Office is working to determine the cause of death.