"Spin City" star Michael J. Fox said today he is leaving the ABC sitcom, but not show business, because of his fight against Parkinson's disease.

Fox, who revealed in 1998 that he suffers from the degenerative neurological disorder that affects movement, said this will be his last season with the highly rated series.

"I could not be more proud of the show . . . and all that we have accomplished over the last four years, yet I feel that right now my time and energy would be better spent with my family and working toward a cure for Parkinson's disease," the 38-year-old actor said.

"This does not mean I am retiring from acting, producing or directing, only that I want to relieve the strain of producing and performing a weekly network series," he said in a statement.

ABC, which had no comment on the show's future, called "Spin City" a "labor of love" for Fox. "Clearly there are more important things in life and we wish Michael and his family our heartfelt thanks and support," the network said. "We look forward to working with Michael in his future endeavors."

Fox, who is up for a Golden Globe award Sunday, plays a hard-charging deputy mayor on the series. His co-stars include Barry Bostwick and Heather Locklear, who joined the cast this season.

The former star of the sitcom "Family Ties" and the "Back to the Future" movies told of his incurable illness in the December 1998 issue of People magazine.