A Florida woman needed advice on cutting the strength of her heroin supply. So she turned to her incarcerated boyfriend. “You’ll figure it out,” Robert Rigby, in jail on drug charges, told Melissa Winings in a phone call. “If you get hit in the head enough times you learn to wear a helmet.” A day later, Winings was arrested, charged with manslaughter. Police say she gave carfentanil to a 34-year-old Sarasota man who then died.