DOYLESTOWN, Pa. -

Officials say an inmate who was found dead at the Bucks County Correctional Facility died from cardiac arrest related to heroin withdrawal.

The Bucks County director of public information says Marlene Yarnall, 49, of Bensalem, was found dead in her cell on Saturday morning. She was being housed in the prison's detox unit.

The coroner says Yarnall had cardiomyopathy, also known as an enlarged heart. He says she had a history of drug abuse, heart disease and high blood pressure.

The coroner also says Yarnall suffered a heart attack while in custody last year.