Maryland's medical examiner has concluded a jail inmate accused of killing a police officer was strangled in his cell.

Nineteen-year-old Ronnie White was found dead in his cell in June, days after Cpl. Richard Findley was struck and dragged by a stolen truck allegedly driven by White.

A spokesman for State's Attorney Glenn Ivey says the report released Thursday found White was the victim of a homicide caused by asphyxiation by a sheet or another item. The finding agrees with a preliminary autopsy.

Ivey has said investigators would question seven corrections officers with access to White's cell. The FBI opened a civil rights investigation.

The Prince George's County Jail has had several security lapses and allegations of misconduct by guards in recent years.