According to investigators, officers were called to a home near Prospect and Gotham streets around 1:30 a.m. after receiving a report of an injured person.
Officers found the victim outside the residence suffering from unspecified injuries. He was rushed to hospital where he later died. At the time, her death was deemed suspicious and the Homicide Unit was called.
On Tuesday, police said an autopsy determined the woman had been shot.
Investigators identified the victim as Toronto resident Nicole Mercer.
No suspect information has been released by police in connection with the investigation.
Police are currently appealing for witnesses and are asking anyone who has not yet spoken to investigators to contact or contact Crime Stoppers anonymously.