Highway 401 has been reopened in both directions. OPP are investigating the crash.
The identity of the deceased has not yet been released.
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At least one person is dead after a serious multi-vehicle collision, that's had closed the 401 in both directions.
Ontario Provincial Police say the crash happened around 2:30 p.m. Sunday and involved a tractor trailer and two other vehicles.
As of 9:00 p.m., OPP said they were preparing to re-open the 401 westbound while the eastbound highway would remain closed at Mile Marker 705.
The crash comes as many commute home from the popular Brockville Tall Ships festival. The annual event attracts tens of thousands to the area.
This is the second deadly crash on the 401 in recent days after a crash, also involving a tractor trailer, killed one man near Gananoque Wednesday morning.