Police were called to an address in the area of St. Dennis Drive and Don Mills Road at 2:30 p.m. on Saturday.
They found a female victim at the scene with obvious signs of injury. She was pronounced dead at the scene.
The victim was 26-year-old Vilanong Douangphachanh of Toronto.
A man was arrested at the scene.
Achint Ranhotra, 28, of Toronto, faces a single count of manslaughter.
Ranhotra appeared in court on Monday.