Jack Kelly (actor)
John Augustus Jack Kelly Jr. simply known as Jack Kelly, was an American film and television actor most noted for the role of Bart Maverick in the television series Maverick, which ran on ABC from 1957 to 1962. Kelly shared the series, rotating as the lead from week to week, first with James Garner as Bret Maverick then with Roger Moore as Beau Maverick and Robert Colbert as Brent Maverick , before becoming the only Maverick in the fifth season.
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Source: Wikipedia