White actor Harry Shearer is stepping back from voicing the black Dr. Hibbert on "The Simpsons" after more than 30 years. While some fans are mourning his departure, the latest white actor to think better of playing non-white parts, others are shocked and surprised that Springfield's favourite medical professional was as white as his lab coat. We look at how Hollywood is realising that black voices matter: 'The Simpsons' Dr ...