Derek Martin's son has died just days after the death of the EastEnders legend. David Rapp, who, like his father, had started working in the entertainment industry, had been alongside his dad when he died earlier this month. No cause of death has yet been disclosed for David. David had worked as a booker for the BBB, working with actors and huge organisations such as the BBC , Channel 4 , Pixar and Sony. BBB Talent Agency said in a statement: "Devastating news today. Just after losing his