A visit in September to the Centre for Addiction and Mental Health in Toronto from nurse Elizabeth Tracy Mae Wettlaufer is being reported by media sources as the catalyst for the investigation into eight nursing-home murders.
Wettlaufer, at CAMH last month, shared information about the deaths which prompted staff to contact Toronto police.
The 49 year old former care worker has been charged with eight counts of first-degree murder after giving unidentified drugs to seven elderly residents at Caressant Care Woodstock and one resident at Meadow Park long-term-care home in London.
Ontario Provincial Police said the deaths occurred between 2007 and 2014.
Caressant Care is a privately run organization comprising 15 nursing homes across Ontario with just over 1,200 residents under its care.
Police said the investigation began in Woodstock on September 29th, then expanded to London, Oxford and Brant counties.
Police announced on October 14th that a suspect had been identified and there was no further risk to public safety.