He will be remembered for his warm radio delivery, but the final weeks of his life were shrouded in turmoil.
His voice made him radio royalty and a pop culture icon.
For 39 years Kasem counted down the nation's hit songs as the friendly host of American Top 40.
Born to Lebanese parents in Detroit, Kasem was passionate about music and radio.
He hit it big as creator and host of American Top 40 - later branching out into television with American Top 10 in 1980.
His radio countdown featured little-known facts about the recording artists before each song and later, in 1978, Kasem started his signature long distance dedications that often tugged at the listener's heart strings.
He also lent his trademark voice to commercial ads and cartoon characters including the voice of Shaggy in Scooby Doo.
Kasem has been honored not only for his work in entertainment, but also for his charitable causes.
But in his final days, his achievements were overshadowed by family turmoil.
Diagnosed with Lewy Body Disease, his children battled their stepmother, Jean Kasem, for months over his medical care.
His daughter, Kerri Kasem, gained temporary conservatorship over her father.
And last week, when the doctors advised her Kasem was close to death, she halted further life-sustaining treatment, including infusions of food, water and medicine, abiding, she said, by her father's wishes. But it was something that Jean disputed.
Long after the legal battles are settled and he is laid to rest, one thing is sure to remain -- Casey Kasem will be remembered as a legendary voice of American Radio.