He voiced Shaggy on the 1969-1972 TV series "Scooby-Doo, Where Are You!"
In addition to the two classic Scooby 
series, Casey voiced Shaggy for a number of the Scooby Doo TV... [DOC] [TLE] Scooby Doo Voices 1969 - Qone8 [PAR] Scooby Doo, Where Are You!