 In 1978, according to testimony in the trial of four murdered teenagers, their killings were part of a failed attempted scheme to kidnap four prominent Vancouver-area families including James Sinclair's.He died in 1984 of a myocardial infarction at his home in West Vancouver.Married in Saint Stephen's Anglican Church, West Vancouver on November 2, 1940 to Doris Kathleen Bernard (February 11, 1920; Penticton, British Columbia – March 29, 2012; Saanich, British Columbia), he was the father of five daughters.