The cause of death for Isaac Freeman III, better known as rapper Fatman Scoop, who died after suffering a medical emergency during his performance at Hamden Town Center Park on Friday, is not yet known, state officials said.

The Office of the Chief Medical Examiner said the cause of death still requires further study and is still unknown as of Sunday afternoon.

Freeman, who was 53 and from New York City, collapsed on stage while performing and received CPR before being transported to a hospital via ambulance.

The Hamden Fire Department said emergency crews were dispatched at 8:26 p.m. to the center for a report of an unresponsive person, later identified as Freeman, in cardiac arrest.

The report said bystanders with medical training and Hamden police officers performed CPR on Freeman until medics arrived and took over the care, which included the use of an automated external defibrillator, a portable device used to treat heart attacks with electrical shocks.

Freeman originally was scheduled to perform in Hamden in July as part of the town's Free Summer Concert Series, but the show was postponed to Friday night. He also took the stage at New Haven's Westville Music Bowl in 2021.