Police now say the victims of that triple murder near Burk's Falls last week were shot to death.
The fourth death, the suspected shooter, has also been confirmed as a self-inflicted gunshot wound.
A post-mortem examination of the three victims has confirmed the cause of death.
Police had earlier said they found a handgun and a long gun in the Theorets' house but have not yet indicated why they were killed.
The victims involved formed three generations of the same family and all resided at the location where they were murdered and are identified as:
- Raija Turanen, 88-years-old
- Ulla Theoret, 55-years-old
- Paul Theoret, 28-years-old
The fourth person, and suspected shooter, has been identified as Mark Jones, 58-years-old, also of Ryerson Township.
Thomas Theoret, who lost his mother, brother and grandmother, said Monday that his loved ones were killed by a neighbour who had been "stalking" his parent.
He said Jones and his mother had known each other for a while before their relationship soured.
Theoret said one of his other brothers, who lives in another Ontario community, eventually told Jones to leave the family alone.
"My mom didn't really date (Jones) but I think they were just friends for a couple months," he told The Canadian Press. "Then he started acting kind of strange and kind of stalking her."
The bodies of Theoret's family members and Jones were found by a friend who stopped by the home for a pre-arranged visit around 7:30 p.m. on Friday, police have said, noting that the deaths took place sometime between Wednesday evening and the time of the discovery.
The OPP is asking anyone who may have had contact with any of these individuals on Thursday, Feb. 22 or Friday, Feb. 23, to contact them.
This triple homicide/suicide investigation remains ongoing with members of the Ontario Provincial Police Almaguin Highlands Detachment, OPP North East Region Crime Prevention and Criminal Investigations Unit, OPP Forensic Identification Services, NER Emergency Response Team and OPP Canine Unit, under the direction of Detective Inspector Martin Graham, of the Criminal Investigation Branch.
Any person with information regarding this incident should immediately contact the OPP at 1-888-310-1122 or their nearest police authority.
Should you wish to remain anonymous, you may call Crime Stoppers at 1-800-222-8477 (TIPS) or submit information online at www.tipsubmit.com where you may be eligible to receive a cash reward of up to $2,000.
With files from Canadian Press.