Suspected Cop Killer Found Dead in Jail Cell, Its Ruled a Homicide

County officials say the death of a 19-year-old found slumped in his jail cell a day after his arrest for running over and killing a Prince George's County police officer has been ruled a homicide.

The Maryland Medical Examiner ruled Monday that Ronnie White died from asphyxiation and strangulation. Prince George's County Executive Jack Johnson says, "If we have vigilante justice, our society will fall apart."

Officials say seven guards had access to White at the time of his death, as well as an unspecified number of supervisors. Authorities are also investigating whether anyone from the outside had access to the prisoner.

Maryland State Police and the FBI are investigating the death. Johnson said that he believes the death was "unrelated to any act by the Prince George's County Police Department.