Kathleen Erin Walsh (born October 13, 1967) is an American actress and businesswoman. Her roles include Dr. Addison Montgomery on the ABC television dramas Grey's Anatomy and Private Practice, Rebecca Wright on the short-lived NBC sitcom Bad Judge, Olivia Baker on the Netflix drama series 13 Reasons Why, and The Handler in The Umbrella Academy. Walsh was born in San Jose, California, the daughter of Angela Walsh. She grew up in a Catholic household in Tucson, Arizona. Her mother is of Italian descent. Walsh graduated from Catalina Magnet High School and studied acting at the University of Arizona before dropping out. Walsh moved to New York City and joined a comedy troupe, Burn Manhattan, supporting herself by waitressing.In April 2007, Walsh began dating 20th Century Fox executive Alex Young. Young proposed to Walsh during a trip to San Francisco, California. They married on September 1, 2007 at the Ojai Presbyterian Church in Ojai, California. On December 11, 2008, Young filed for divorce, citing irreconcilable differences; the official date of separation in the divorce petition was listed as November 22. On December 24, 2008, Walsh counterfiled for divorce, contesting the date of separation listed in Young's divorce papers. The divorce was finalized on February 5, 2010.

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