American actor-comedian Robin Williams' wife of almost 19 years has filed for divorce.

Marsha Garces, who married Williams in April 1989, not long after his divorce from Valerie Velardi, cited irreconcilable differences on a divorce petition filed in San Francisco on March 21, hollywood.com reports.

The couple have a daughter and a son together - Zelda, 18 and Cody, 16.

Garces has worked on several of Williams' films as a producer, including 'Mrs. Doubtfire' and 'Patch Adams'.