FISHKILL, N.Y. (AP) The former oral surgeon considered the mastermind of an illegal body parts harvesting ring has died at a New York prison.

Corrections officials say 49-year-old Michael Mastromarino was pronounced dead around 10 a.m. Sunday at St. Luke's Hospital in Cornwall. The agency says he had been taken there from the medical unit at Fishkill state prison.

Officials say a medical examiner will determine the cause of death, which appears to be from natural causes. His attorney told New Jersey media outlets that Mastromarino had cancer.

The former Fort Lee, N.J., dentist was sentenced in 2009 to up to 58 years in prison for his role in a multistate ring that illegally harvested body parts. Mastromarino and others would cut up corpses from funeral homes and then sell the body parts to unsuspecting doctors.