Scott Law attacked the football pundit at the Emirates Stadium last year.
A man has been found guilty of headbutting former Manchester United midfielder Roy Keane during a "gratuitous and senseless act of violence".
The former Ireland captain had been working for Sky Sports at the Emirates Stadium in north London when he was assaulted, Highbury Corner Magistrates' Court heard. Mr Richards told the court he was in "disbelief" at what he witnessed, and "felt sorry for Roy" who he described as a friend.
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