The investigation has wrapped up following a fire on Hickory Road.
Windsor Fire says the cause has been listed as careless use of smoking materials.
The fire broke out last Thursday around 10:30pm at a home at 1564 Hickory Road near Seminole.
One woman suffered serious injuries and was transferred to a hospital in Hamilton.
The home is divided into four apartment units and smoke and flames were found in one of the units.
An investigator with the Ontario Fire Marshal's Office was called in to investigate.
The were four people inside the unit at the time of the blaze.