Brockville police arrest 17-year-old after 3 deaths on Cartier Court

brockville police arrested a 17-year-old boy on Thursday after a woman and her two daughters were found dead inside a home on Cartier Court. Officers said the deaths are being investigated as a triple murder after evidence at the scene led them to treat the case as suspicious.

The call came at about 11:30 a.m., when police responded to a 911 report about three dead people at the residence. Officers found three people dead inside. Brockville Police Service Insp. Darryl Boyd said the victims were a mother in her mid-40s and her daughters in their mid-teens to early 20s.

Cartier Court response

Police charged the 17-year-old in connection with the killings the same day. Boyd said investigators were still getting search warrants Thursday evening and that they would be working around the clock for the foreseeable future. He added, “I haven’t seen anything like it in my career.”

The case stands out in a city where Boyd said this was the first homicide in years and the first triple murder in recent memory. Police also said they later received information that led them to an address on the outskirts of Brockville, which Boyd identified as Old Red Road.

Old Red Road search

The move from Cartier Court to Old Red Road shows the investigation was still active after the initial arrest. For Brockville residents near either address, the practical consequence is that detectives are still building the case through warrants and follow-up work, while police have already tied the deaths to a broader homicide inquiry.