John Graham "Mac" McVie(born 26 November 1945) is aBritishbass guitarist. He is bestknown as a member of rock groupsJohn Mayall & the BluesbreakersandFleetwood Mac. He joinedFleetwood Mac shortly after its formation by guitaristPeter Greenin 1967. He replaced bassistBob Brunning. In 1968, he married blues pianist and singerChristine Perfect, whobecame a member of Fleetwood Mac two years later. John and Christine McViedivorced, however, in 1977. On 27 October 2013, Fleetwood Mac announced ontheir Facebook Page that McVie had been diagnosed with cancer and would beundergoing treatment. He hascontinued to play with the band during their 2014 On With The Show tourfollowing an improvement in his condition.