Porsche office says it is focusing on speed as the cause of Monday 's fiery crash . Porsche family asks for charity donations instead of flowers . Walker 's racing team partner was driving the Porsche . The actor was in the middle of producing the 40th Sheriff 's movie when he died .
Sheriff 's office says it is focusing on speed as the cause of Saturday 's fiery crash . Walker family asks for charity donations instead of flowers . Walker 's racing team partner was driving the Porsche . The actor was in the middle of producing the seventh `` Fast & Furious '' movie when he died .