AUBURN — An inmate at the Androscoggin County Jail, who was arrested this week in a heroin overdose death, has died.

Scott A. Harmon, 52, of Auburn was found unresponsive in his cell Thursday at approximately 6:15 p.m., according to the Androscoggin County Sheriff’s Department. Jail officials provided medical assistance before he was transported to Central Maine Medical Center in Lewiston, where he died.

Harmon was arrested Wednesday and charged in the Nov. 14 heroin overdose death of Amy Jo Flood, 38, of Auburn.

The cause of Harmon’s death is still pending, and the Chief Medical Examiner’s Office is also investigating, the Sheriff’s Department said.

Because Harmon was an inmate at the time of his death, the Maine State Police Major Crime Unit and the Inspections Division of the Maine Department of Corrections were notified to investigate. The Androscoggin County District Attorney’s Office was also notified as part of standard protocol.

On Wednesday, agents from the Maine Drug Enforcement Agency and the federal Drug Enforcement Administration executed a search warrant and arrested Harmon at his home at 16 Washington Park Road in connection with Flood’s death, according to court and jail records.

Officers believe the heroin Flood used was obtained from Mark Colello, who bought it from Harmon, according to Nicholas Gagnon, a special agent with the Maine Drug Enforcement Agency. Colello was Flood’s boyfriend at the time.

Colello, 41, of 29 Washington Park Road was charged Nov. 15 with aggravated furnishing of a Schedule W drug. Schedule W drugs include amphetamines, cocaine and its derivatives, and heroin and similar opiates.

Harmon had been charged with aggravated furnishing of a schedule W drug and unlawful furnishing of a Schedule W drug, both felonies. Harmon was being held at the Androscoggin County Jail on $25,000 cash bail pending an appearance at 8th District Court in Lewiston.