Tim Cook, renowned chief historian at the Canadian War Museum and a prominent military historian, has died at the age of 54. Cook was a passionate ambassador for Canadian military history, contributing over two decades to the museum since 2002. His work included curating major exhibitions such as Victory 1918, Communities at War, and War and Medicine, as well as leading the museum's oral history projects. An acclaimed author, Cook published more than 19 books, winning awards like the Ottawa Book Award and the Charles Taylor Prize for his notable works including *Life Savers and Body Snatchers*, which revealed Canadian doctors' involvement in organ harvesting from fallen soldiers during WWI. He was also honored with the Order of Canada and the Governor General's History Award. Despite extensive public curiosity, the cause of his death has not been disclosed. The Canadian War Museum praised his enormous contributions and mourned his loss, describing him as a 'passionate ambassador' for Canadian military history.