RCMP in that Vancouver Island city say the unnamed victim was found in a home on Wednesday afternoon.
Her name has not been released and investigators have not yet said how she died.
A 19-year-old woman and 24-year-old man were also found in the house.
Cpl. Gordon Hay says the man was injured and has been airlifted to a Victoria hospital for treatment, but is expected to recover.
The 19-year-old woman is in custody and police are not commenting on how she or the injured man may be connected to the older woman's death.
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