Benavides waited in his truck until the gunman disappeared before assisting Tippit. He then reported the shooting to police headquarters, using the radio in Tippit's car. Helen Markham witnessed the shooting and then saw a man with a gun in his hand leave the scene. Markham identified Oswald as Tippit's killer in a police lineup she viewed that evening. Barbara Davis and her sister-in-law Virginia Davis heard the shots and saw a man crossing their lawn, shaking his revolver, as if he were emptying it of cartridge cases. Later, the women found two cartridge cases near the crime scene and handed the cases over to police. That evening, Barbara Davis and Virginia Davis were taken to a lineup and both Davises picked out Oswald as the man whom they had seen.