Three family members have been charged in the killing of a security guard who told a customer at a Michigan Family Dollar store to wear a state-mandated face mask, officials said on Monday.Calvin Munerlyn, 43, died at a Flint hospital after he was shot in the head Friday, said Michigan State Police Lt. David Kaiser.Ramonyea Travon Bishop, 23, Larry Edward Teague, 44 and Sharmel Lashe