Barrie police have officially identified the victims of a double murder as 73-year-old Alan Mallinson and his 39-year-old son Matthew.
A forensic post-mortem has determined both men were stabbed to death.
Barrie officers made the gruesome discovery of the bodies early Wednesday morning at the Mallinson's home at 69 Eden Drive.
Police went to the address to look for the registered owner of a vehicle involved in a pursuit with the OPP around 5 a.m.
An OPP officer had stopped to check on a pickup truck that was pulled over with its 4-way flashers activated on Highway 26 in Springwater Township.
The pickup truck took off after a short conversation with the officer who gave chase, but then aborted the pursuit due to safety reasons.
The truck was later found abandoned on a Barrie side street.
OPP were later called to Shanty Bay for a report of a suspicious male walking down the road.
Police took the man into custody and determined he was the driver of the pickup truck involved in the pursuit.
45-year old Robert Twiss of Barrie is charged with two counts of first-degree murder, indignity to a dead body and flight from police.
He is due to re-appear in court on Feb. 3.
Police said this week that the victims could have been dead for up to 5 days prior to being found.
It's not the first tragedy to happen in the Mallinson's Eden Drive townhouse.
Susan Mallinson, Alan's wife and Matthew's mother, died suddenly at the home in November of 2012 at the age of 64.
Barrie police say they are aware of Susan's death and believe it was due to natural causes and not suspicious.
Neighbours have described Alan Mallinson as a nice man who used a walker and would often sit in his garage.
Investigators anticipate they will be processing the scene throughout the weekend.
Any information pertaining to this investigation can be forwarded to the Barrie Police Homicide Unit at 705-725-7025 Ext.2160 or call Crime Stoppers at 1-800-222-TIPS or leave an anonymous tip online at www.tipsubmit.com