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Robin Williams' second wife has filed for divorce from the US actor after nearly 19 years of marriage.

Marsha Garces Williams filed the papers at a San Francisco court, citing irreconcilable differences.

The couple, who married in 1989, have been separated since December and have two children together.

The pair met when she worked as a nanny for Williams' son Zachary, whom the actor had with his previous wife, Valerie Valardi.

Court documents show Mrs Williams has requested joint custody of their 16-year-old son. Their daughter, Zelda, is 18.

She has worked as a producer on her husband's films and co-owns their production company, Blue Wolf Productions.

Robin Williams rose to fame in the 1970s playing the comic space alien Mork in hit US TV show Mork and Mindy.

In 1998 he won an Oscar for best supporting actor playing a psychologist in the film Good Will Hunting.

source: BBC News Online