EMS transported Joseph Sharp, 47, to Flushing Hospital, where he later passed away.
The medical examiner will determine the cause of death.
Mr. Sharp worked for the Parks Department as a City Seasonal Aide in various positions since 2006 according to the agency.
"We are saddened to hear of the loss of Joseph Sharp," the Parks Department said in a statement.
"Mr. Sharp began with Parks in 2006, serving in capacities ranging from Job Training Participant to City Seasonal Aide to Filter Plant Operator at Fisher Pool. He assisted with SuperStorm Sandy recovery. At the time of his passing, he was working as a seasonal CSA at the Kissena Park tennis courts.
Our thoughts are with his family during this difficult time."