Wendi Deng is perhaps best known in Britain for defending husband Rupert during a physical attack at a parliamentary hearing in 2011.
The Chinese-born businesswoman was seen landing a slap on the face of activist Johnnie Marbles, who had attempted to throw a foam pie at Mr Murdoch.
More top news
Wintry weather into the weekend
Jeremy Hunt could impose controversial new contracts for junior doctors by Monday, ITV News Political Editor Robert Peston has learned.
A new video has emerged online purporting to show a four-year-old British boy blowing up a car and killing three prisoners on behalf of IS.