Ontario Fire Marshal Concludes Investigation into Fatal John Street Fire

Cornwall Fire Services, in coordination with the Office of the Fire Marshal (OFM), has concluded its investigation into the structure fire at 31 John Street on January 1, 2026. The OFM has determined that the cause of the fire is undetermined.

Tragically, one fatality was confirmed as a result of the incident. The name of the deceased will not be released until next of kin have been notified.

“Our thoughts are with the family and loved ones affected by this loss,” said Matthew Stephenson, Deputy CAO and Chief of Fire Services. “We thank our firefighters for their professionalism and dedication under extremely challenging conditions.”

The investigation revealed that there was only one working smoke alarm in this four-unit building. In a property of this size and configuration, there should have been more than ten working smoke/carbon monoxide alarms to provide adequate protection for all residents. This incident highlights the critical importance of complying with fire code requirements and ensuring that every unit and common area is equipped with functioning smoke alarms.

Smoke & Carbon Monoxide Alarms Save Lives

Cornwall Fire Services reminds all residents that working smoke and carbon monoxide alarms are essential and required for home safety. Fatal fires highlight the importance of having alarms on every level of your home and testing them monthly. Replace smoke alarms every 10 years and never disable them.

“Working smoke and carbon monoxide alarms and practicing an escape plan can mean the difference between life and death,” added Chief Stephenson.

In addition, Cornwall Fire Services will be initiating an "After the Fire" program in the affected area within the next couple of weeks to provide fire safety education, support, and resources to residents.

There are many public resources available on smoke and carbon monoxide alarm safety. We encourage you to visit https://www.cornwall.ca/en/live-here/prevention.aspx for more information.