8 year-old boy accidentally shoots sister dead with his mother's boyfriend's gun

An eight year-old boy has shot his five year-old sister to death after they were left home alone with their mother's boyfriend's gun. The mother left them to go to the store when the little boy picked up the gun and fired a single shot at his sister, Serenity Allen, who died instantly. The police has arrested their mother's boyfriend, Maurice Mobley, 34, after he turned himself in. Maurice