A lawsuit says a crew of prison guards known as the "Beat Up Squad" killed a handcuffed inmate in a New York City lockup.

The lawsuit was filed Wednesday in federal court in Manhattan by the family of 30-year-old Samuel Harrell. It alleges that the "Beat Up Squad" repeatedly punched and kicked Harrell during a confrontation this year at the Fishkill Correctional Facility.

The medical examiner ruled the death a homicide.

Last month, federal prosecutors announced they were joining an investigation by local authorities into Harrell's death. He was serving an eight-year term for a drug conviction at the time of his death.

The lawsuit seeks unspecified damages.

There was no immediate response to a message left with the state Department of Corrections.