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ET has the latest...
UPDATE: Per ROBIN WILLIAMS' spokesperson, the reason for the divorce is "irreconcilable differences."
ET confirms the comedian's wife, MARSHA GARCES WILLIAMS, filed a divorce petition in San Francisco Superior Court on March 21.
The couple, who were married in April 1989, have two children: a
daughter Zelda, 18, and a son Cody, 16. Marsha is asking for joint
legal custody of Cody; with physical custody going to her and
visitation for Robin.
Robin and Marsha met while she worked as a nanny for Robin's first son, Zachary, born in 1983 to Robin and his first wife. Marsha subsequently worked as personal assistant to the comedian.