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HOLLYWOOD - SEPTEMBER 30: Dylan Walsh attends the 'Secretariat' film premiere at the El Capitan Theatre on September 30, 2010 in Hollywood, California. (Photo by Jean Baptiste Lacroix/WireImage)
The couple, who have a 7-year-old daughter together, citied "irreconcilable differences" as the reason for their split.
According to a petition filed on December 10 in Los Angeles Superior Court, the couple has been separated since October 1.
This was Walsh's second marriage. He and former Big Love star Melora Walters divorced in 2003 after seven years. They have two children together.