Reclusive movie star Sean Penn has agreed to a sit down interview with CNN talk show host Larry King to talk frankly about his brother CHRIS' death. Actor Chris Penn died in mysterious circumstances, and was later diagnosed with an enlarged heart, in January (06), leaving many to suggest the Reservoir Dogs star had been dabbling with drugs. But, keen to clear up the rumours, Penn spoke about his brother's passing on a taped segment for LARRY KING TONIGHT. The Oscar winner says, "The problem was weight... He'd certainly been a fantastically self-abusing guy over periods of his life but that wasn't the case it the end. It was a natural death." The rare Sean Penn interview, in which he also chats about working with SIR Anthony Hopkins in new film ALL THE KINGS MEN, will air in the US later today (14SEP06).