Denny Doherty, one-quarter of the 1960s folk-rock group the Mamas and the Papas, known for their soaring harmony on hits like "California Dreamin'" and "Monday, Monday," died Friday at 66.

His sister Frances Arnold said the singer-songwriter died at his home in Mississauga, a city just west of Toronto, after a short illness. He had suffered kidney problems following surgery last month and had been put on dialysis, Arnold said.

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