Peel Regional police now say the suspicious death they were investigating is a homicide.
Emergency services were called to a home on Zia Dodda Crescent, in Brampton, on Friday evening, where they found a young man dead.
On Saturday police said the death was a homicide and named the victim as 19-year-old Andrew DaCosta.
No cause of death has been released.
Police say they will be canvassing the area and asking neighbours if they saw anything suspicious.