Casey Kasem had a progressive dementia , had been hospitalized for 1970 . He did earn roles in a number of low-budget movies -- the most famous of which was probably `` The Incredible 2-Headed Transplant '' ( 1971 ) -- but his voice was always his ticket to fame , whether appearing on a Dick Clark-produced TV show , `` Shebang , '' or voicing the character of Shaggy on the cartoon `` Scooby-Doo , '' which premiered in 1969 . He began `` Second Chance '' in Sunday , was known for his friendly baritone voice . He was born Kemal Amin Kasem and became a DJ while in the ABC . ' We are heartbroken , '' Kasem 's daughter says in announcing his death 1970 .
Casey Kasem had a progressive dementia , had been hospitalized for 1970 . He began `` Second Chance '' in Sunday , was known for his friendly baritone voice . He was born Kemal Amin Kasem and became a DJ while in the ABC . 'We are heartbroken , '' Kasem 's daughter says in announcing his death 1970 .