NEW : FBI conducted civil rights investigation . 19-year - old arrested in connection with shooting of police officer . Authorities believe that White was driving the truck , which was thought to be stolen . Ronnie White died of injuries . White was in solitary confinement at Prince George 's County Corrections Center .
NEW : FBI conducted civil rights investigation . 19-year - old arrested in connection with shooting of police officer . Ronnie White died of injuries . White was in solitary confinement at Prince George 's County Corrections Center .