Rhona Margaret Duncan was a 16-year-old white female from North Vancouver, British Columbia, who was found murdered near her home in the early morning hours after leaving a large birthday party on East Queens Avenue. Accounts place the party night on July 16 into the early morning of July 17, 1976. After walking part of the way home with friends, Rhona separated and continued alone; a neighbour later heard an argument around 3:00 a.m. Her partially clothed body was discovered about 9:00 a.m. in tall vegetation near a neighbour’s garage. A post-mortem found she had been sexually assaulted and killed by manual strangulation.

The RCMP investigated extensively, questioned attendees and compiled a list of 172 males linked to the gathering. Early attention focused on her boyfriend Shawn Mapoles, who underwent testing and was later excluded by DNA; no one has been arrested or charged. Decades later preserved evidence produced a DNA profile of an unidentified attacker; more than 170 men from the original inquiry were tested but none matched, and several potential subjects were unavailable by that time. The homicide remains an open cold case.

Did anyone who knew Rhona or attended that party have information that was never shared with investigators?