A Braintree man was arrested Saturday night after running through a crime scene where a woman was struck by a car and killed.
According to Boston police, around 7 p.m., officers were guarding a crime scene at 1617 Blue Hill Avenue when police were informed that an unknown man had entered the crime scene.
Hours earlier, 37-year-old Ibraim Matos of Hyde Park fatally struck a woman with a vehicle that he had carjacked…