State police are mourning a retired officer who died from a 9/11-related illness.

Zone Sgt. Steven W. Greene died on Friday, they said. He was 65.

Greene worked at the World Trade Center site following the attacks.

He retired from Troop B of the New York State Police on July 17, 2002, after 20 years of service on the force. Troop B serves the very northern part of New York state.

Greene is survived by his wife and two sons.

Funeral arrangements have not yet been announced.