Kilmarnock just minutes after a mum and her daughter were knifed to death in a double slaying has been named locally as Steven Robertson.The 40-year-old passed away after a car crash on the C50, a road between the B7036 and the A76, at around 8.30pm on Thursday.Mercy crews raced to the scene but he was declared a short time later as officers locked down the scene.Specialist forensic teams were today seen scouring the wreckage of the vehicle, which collided with a tree.