The town of Mayerthorpe, Alta., is holding a candlelight vigil on Saturday night to honour four Mounties killed in the line of duty seven years ago.

Fallen Mounties Read more about the RCMP officers killed.

Royal Canadian Mounted Police constables Anthony Gordon, Leo Johnston, Brock Myrol and Peter Schiemann were shot and killed by James Roszko on his farm on March 3, 2005.

The officers were on Roszko's property to guard a marijuana grow-op and an automotive chop shop discovered the day prior to the ambush. Roszko had fled his farm after bailiffs tried to repossess his truck.

After the shooting Roszko turned the gun on himself.

The candlelight vigil will commemorate the Mounties, as well as all uniformed officers who have died in the line of duty across Canada.

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The ceremony will take place at the Fallen Four Memorial Park in Mayerthorpe at 7 p.m. Saturday.