Alberta RCMP have linked the deaths of four young women, five decades ago, to a deceased serial sexual offender and killer.
RCMP said the historical homicides, all dating to the 1970s, have been linked to the same killer.
The same killer may have been responsible for other homicides that remain unsolved, police said.
Investigators have not released the names of the victims but Calgary police told CBC News Friday, the four homicides all occurred in the Calgary area.
Investigators with the Alberta RCMP historical homicide unit will provide more details on the investigation at a news conference Friday.
In a statement, police said they hope that releasing details of the investigation to the public will help them potentially solve other cold cases.
Following a technical briefing for media, RCMP will hold a news conference Friday at Alberta RCMP headquarters in Edmonton. The news conference is expected to begin at 11:30 a.m. MT.
CBC will carry the news conference live. You can watch it live here.
In a statement, the Calgary Police Service said its members were involved in the investigation.
Insp. Kevin Forsen of the Calgary Police Service major crimes section will hold a news conference Friday afternoon at 1 p.m. MT.
CBC News will report details on the investigation as they become available.