The 1935 Royal Canadian Mounted Police Killings were a series of murders of three Royal Canadian Mounted Police and one local constable from 5–8 October 1935. They began with the murders of Benito Constable William Wainwright and RCMP Constable John Shaw near Pelly, Saskatchewan, by three Doukhobor men who had been in the custody of the officers. This led to a shootout which killed two additional RCMP officers in Banff, Alberta, and the death of perpetrator Joseph Posnikoff. The remaining two perpetrators were shot by Banff Park Game Warden William Neish, as they were pursued by a combined posse of RCMP officers and armed civilian volunteers.