David Del Rio in 'Matlock' Sonja Flemming/CBS Share on Facebook Share on X Share to Flipboard Send an Email Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Print the Article Post a Comment Logo text CBS' Matlock has fired one of its series regulars after an allegation of sexual assault. David Del Rio, who plays attorney Billy Martinez on the legal drama, was let go after an incident involving him and a female member of the show's cast, sources confirm to The Hollywood Reporter.