"The King" was in REALLY bad shape physically, weighing some 350 lbs., on a ton of prescription pain meds, and he had an enlarged heart too...its also been suspected that, due to falls in his career filming movies, Elvis suffered from brain trauma, which may explain his change in mental state over the years and why he was constantly in pain...Elvis was worth $10 million when he died at the age of 42, he's worth today, 40 years after his death, $400 million...Getty Images