NEW YORK (AP) — Vin Diesel still struggles over the loss of his friend and "Furious" co-star Paul Walker, so taking on the role of an immortal in the upcoming film "The Last Witch Hunter" helped him deal with his grief. Diesel is no stranger to fantasy and sci-fi films, having starred in "The Chronicles of Riddick" series, "Babylon A.D.," and "Guardians of the Galaxy," but this one was special for him. Walker died in late 2013 after the Porsche in which he was a passenger crashed and burned north of Los Angeles during a holiday break in the filming of "Furious 7," the latest installment of "The Fast and Furious" franchise.