An off-duty NYPD sergeant was killed yesterday morning in a fiery one-car crash on Long Island.

Anthony Johnson, 32, was driving home when he lost control of his Jeep Cherokee on the Southern State Parkway in Valley Stream just west of Rockaway Avenue and smashed into a tree at 3:08 a.m.

Johnson, an eight-year veteran, was assigned to the 114th Precinct in Astoria, Queens.

He was single and lived in West Babylon.