Legendary DJ Casey Kasem

Casey Kasem, who entertained radio listeners for almost four decades as the host of countdown shows such as "American Top 40" and "Casey's Top 40," died early Sunday, June 15, according to a Facebook post from his daughter Kerri Kasem.

Casey Kasem, who entertained radio listeners for almost four decades as the host of countdown shows such as "American Top 40" and "Casey's Top 40," died early Sunday, June 15, according to a Facebook post from his daughter Kerri Kasem.