A Wal-Mart Stores Inc employee sued the retailer on Tuesday, saying its prior policy of denying health insurance benefits to the spouses of gay employees violated gender discrimination laws. Wal-Mart, the largest private U.S. employer, began offering health insurance benefits to same-sex spouses last year, after the Supreme Court in 2013 struck down part of the Defense of Marriage Act that denied federal benefits to married gay couples.

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