Warrant issued for Ottawa woman in 2025 Clarence-Rockland homicide
Cathy Percey, 53, charged with first-degree murder in death of Robert Prévost, whose body was found in Ottawa River in May.
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Ontario Provincial Police issued a warrant Tuesday for Cathy Percey, 53, of Ottawa, charged with first-degree murder in the death of Robert Prévost, 63.
Prévost was last seen at his home on Laurier Street in Clarence-Rockland in February 2025 and reported missing the following month. His body was recovered from the Ottawa River in May. Police say Percey is known to frequent Ottawa, Rockland and Gatineau areas and warn against approaching her; anyone who sees her should contact the Russell County OPP at 1-888-310-1122.
Five others were previously charged in the case. Jessica St. Michael of Ottawa and Yvon Cieno of Ottawa face first-degree murder charges, along with additional counts of indignity to a body and conspiracy. Luc Décarie of St-Gabriel-de-Brandon, Quebec, faces similar charges. Mathew Blake of Arnprior is charged with second-degree murder, indignity to a dead body and obstructing a peace officer. Sébastien Boucher of Rockland faces charges of obstructing a peace officer, obstructing justice and accessory after the fact.
The investigation is being handled by the Crime Unit of the Russell County OPP detachment. Anyone with information can contact the detachment at 1-888-310-1122 or leave an anonymous tip with Crime Stoppers at 1-800-222-8477 or ontariocrimestoppers.ca.
The facts
Who was charged with first-degree murder in the Robert Prévost case?
Cathy Percey, 53, of Ottawa, was charged with first-degree murder in the death of Robert Prévost, 63. Jessica St. Michael and Yvon Cieno, both of Ottawa, and Luc Décarie of St-Gabriel-de-Brandon, Quebec, also face first-degree murder charges.
How many people have been charged in this case?
Six people have been charged: Cathy Percey, Jessica St. Michael, Yvon Cieno, Luc Décarie, Mathew Blake of Arnprior, and Sébastien Boucher of Rockland.
