Cathy Smith, the onetime girlfriend of singer-songwriter Gordon Lightfoot who might have been best remembered for inspiring the hit song “Sundown” had she not met up with John Belushi at the Chateau Marmont on March 5, 1982, died Aug. 18 at the age of 73. Her death was reported by Canada’s The Globe and Mail. The longtime resident of Maple Ridge, British Columbia, had been on oxygen and in failing health the past few years, the newspaper said. Smith, who had been a back-up singer (and occasional drug supplier) to the Canadian rockers who would later become The Band (she...