The state medical examiner's office ruled Monday that Ronnie White, 19, who was found dead Sunday in his Upper Marlboro, Md., jail cell had died from strangulation, sustaining breaks in two small neck bones, The Washington Post reported.
FBI agents and Maryland State Police officials were called in to interview guards working that night in the Prince George's County lock-up. They were only people who had access to White, the newspaper said.
"We live in a constitutional democracy and no one has the right to be judge and jury," County Executive Jack Johnson told reporters Monday.
Police said White "intentionally accelerated" a pickup truck with stolen license plates toward Cpl. Richard Findley, 39, striking and dragging him in a parking lot in Laurel, Md., Friday morning. Findley was declared dead later at a hospital. White was arrested by county police later that afternoon and booked into the county jail about 12 hours later.
He was found unresponsive about 10:30 a.m. Sunday, the Post said.