The Royal Canadian Mounted Police (RCMP) says American Chynna Deese, 24, and Australian Lucas Fowler, 23, were found dead last week.
Fowler's father is a senior member of the New South Wales Police Force and has come to Canada with two colleagues.
Stephen Fowler described the murder of his son and his son's girlfriend as "a love story that ended tragically".
"I may be an experienced police officer but today I am standing here as the father of a murder victim," he told media at an RCMP news conference.
