According to the Hollywood Reporter, Murray may do the voice of the cat in the second Garfield that will be released in the summer of 2006.
Actors that have confirmed include, Breckin Meyer (Jon) and Jennifer Love Hewitt (Liz). For Hewitt, her part has been decreased since her time is limited.
Bill Murray is currently doing theatre in the production Broken Flowers.
The first film Garfield came out in 2004, and made 176 million dollars at the box-offices around the world.