Baton Rouge detectives arrested Ron Jermaine Bell in the killing of Sadie Roberts-Joseph, 75, whose body was found stuffed in the trunk of her car on Friday afternoon, Police Chief Murphy Paul told a news conference. The suspect was already in jail in East Baton Rouge Parish for failing to register as a sex offender when police linked him to the murder, said Sheriff Sid J. Gautreaux, III, at the same news conference. Roberts-Joseph's death was ruled a homicide by the East Baton Rouge Parish Coroner's Office on Monday.