Peel Regional Police say they are looking for four suspects after Vittoria Andrew Aiello died of injuries he suffered on Jan. 13.
The death of the 24-year-old Woodbridge man has now been classified as a homicide.
Aiello was stabbed in an apartment near Hurontario Street and Eglinton Avenue on Sunday night.
He was taken to hospital but died of his injuries on Tuesday.
Police say they are looking for four suspects described as black males between 16 and 25 years old who were wearing dark clothing and disguises.
Aiello's death is the second homicide in Peel this year.