In December 1967, Holt disappeared while swimming in rough conditions at Cheviot Beach, Victoria. He was presumed dead, although his body was never recovered; his disappearance spawned a number of conspiracy theories. Holt was the third Australian prime minister to die in office. He was succeeded by Country Party leader John McEwen on an interim basis and then by John Gorton. His death was commemorated in a number of ways, among them by the establishment of the Harold Holt Memorial Swimming Centre in Melbourne.