Four years after his death, a family feud erupts over radio legend Casey Kasem, exactly how he died and who was responsible -- an estate that could be worth $100 million is at stake. "48 Hours"' Peter Van Sant reports. Learn more about your ad choices. Visit megaphone.fm/adchoices See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.