March 3, 2005
RCMP Mayerthorpe Detachment
Cst. Lionide Johnston was killed on March 3, 2005 on the property of James Roszko, 11 km north of Rochfort Bridge, northwest of Edmonton near the town of Mayerthorpe, Alberta. Cst. Johnston was shot and killed, along with RCMP Constables Brock Myrol, Peter Schiemann, and Anthony Gordon, while executing a property seizure on the farm. The Mayerthorpe incident was the worst one-day loss of life for the RCMP in 100 years.