David Boreanaz, Jaime Bergman David Boreanaz, Jaime Bergman

David Boreanaz has admitted to cheating on his wife after he says the woman with whom he cheated attempted to blackmail him, People reports.

"Our marriage has been tainted with my infidelities," the 40-year-old told People. "I just want to be open and honest. I was irresponsible."

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The Bones star did not name the other woman. In October 2009, Star magazine reported that Boreanaz was involved with Rachel Uchitel, a woman who was later also linked to Tiger Woods.

"I was associated with a woman who I was involved with and had a relationship with," Boreanaz said. "She asked for money. I felt as though I was being blackmailed or there was some sort of extortion."

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Boreanaz has been married to Jaime Bergman for nine years and the couple has two children together: 8-year-old Jaden and 8-month-old Bardot.

"We're working on our marriage," he said. "We're working on repairing what has been damaged so badly."

Calls and e-mails to Boreanaz's rep were not immediately returned.