Casey Kasem was the voice of Shaggy back in the day. Matthew Lillard, who really seemed to be channeling Casey, played Shaggy in the movies.
The list of actors to voice
Norville 'Shaggy' Rogers is as follows-
Casey Kasem (1969-1997)
Billy West (1998)
Scott Innes (1999-2002)
Casey Kasem (2002-2009)
Scott Menville (2005-2008) (for Shaggy and Scooby Get a Clue only)
Matthew Lillard (2010- ) (for Mystery Incorporated)
Casey Kasem has retired from the role and Lillard is likely to be the sole voice actor if any other shows or TV movies are made for the time being.
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There are several people who provided the voice for Shaggy over the years. Casey Kasem is the original voice actor and Matthew Lillard is the current.
Casey Kasem voiced Shaggy from 1969-1997.
Billy West did in "Scooby-Doo on Zombie Island" (1998).
Scott Innes did from 1999-2001.
Then Casey Kasem came back to voice him from 2002-2009, except in "Shaggy & Scooby-Doo Get a Clue" in 2006, when Scott Menville did.
Matthew Lillard, who was Shaggy in the live-action movies of 2002 and 2004 has voiced the character since 2010.
If you want, you can follow the link below from BTVA to compare the voices.
The voice of Shaggy in the original Scooby Doo series was performed by Casey Kasem who is also famous for being a top 40 radio host for a number of years.
Hanna Barbera created the show Scooby-Doo and Matthew Lillard is the voice of Shaggy so Hanna Barbera created the show and Matthew Lillard did the voice of Shaggy. If there was no Matthew Lillard and no one else did Shaggy then Shaggy would not be in Scooby-Doo.
I believe it's because his voice started to sound too old.
Shaggy
Scooby-Doo is not Velma's dog, Shaggy owns him.
they met at a yardsale all 4 of them wanted scooby doo but they didnt no each other so they decide to hook up and hang out more, Fred dad gave him that piece of junk and it was a time machine and soo on lol no this is not the answer