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Arnold Schwarzenegger and Maria Shriver in happier times

Wally Fong / AP

Actor and bodybuilder Arnold Schwarzenegger shows off his new U.S. citizenship papers with Maria Shriver by his side at the Shrine Auditorium in Hollywood, Calif., on Sept. 16, 1983.

Brendan Mcdermid / EPA

California Governor Arnold Schwarzenegger with his wife Maria Shriver after taking the oath of office at the Capitol in Sacramento, California, Nov. 17, 2003.

Reuters

California governor Arnold Schwarzenegger and his wife Maria Shriver with their children, left to right, Christopher, Patrick.Katherine and Christina, at the premiere of the film "The Benchwarmers" in Los Angeles, California on April 2, 2006.

 Today Arnold Schwarzenegger announced the reason behind the split with his wife of 25 years. An extramarital affair with a member of his household staff that produced a child. Read the full story, or watch the video report below.

Former California Governor Arnold Schwarzenegger, who recently split from his wife, Maria Shriver, has admitted he fathered a child with a longtime member of his household staff. NBC's Miguel Almaguer reports.