Possible Clues:

• Radio countdown host Casey
• Radio Hall of Fame's youngest inductee
• Radio DJ Casey
• Casey who provided the voice for Shaggy
• 'American Top 40' deejay Casey
• Casey in the National Radio Hall of Fame
• Casey who voiced Shaggy on "Scooby-Doo"
• Detroit-born DJ Casey
• Longtime 'American Top 40' host
• Casey of “American Top 40”