McKellar and husband Mike Verta, a composer, split last week. McKellar filed at the L.A. County Superior Court, citing "irreconcilable differences." The Wonder Years alum is asking for joint physical and legal custody of their 1-year-old son, and, according to the documents the couple has a pre-up.
The 37-year-old actress and math guru wed Verta in March 2009.
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