Police say they have a warrant for Nema Mansouri, 28, of Toronto, who is being sought on charges of second-degree murder and attempted murder in connection with an incident on Colombo Crescent in Vaughan.
Mansouri is being urged to contact legal counsel and to turn himself into police.
At 11:50 p.m. on Wednesday, police responded to a weapons call on Colombo Crescent, near Jane Street and Teston Road.
Police say that an altercation had occurred, which resulted in two victims — a 22-year-old man and a 27-year-old man —suffering stab wounds. The two men are cousins.
Both victims were taken to Toronto's Sunnybrook Hospital where one man was pronounced dead. The other is in serious but stable condition.
On Thursday morning, York Regional Police identified the deceased as Muzaffar Goraya, 22, of Vaughan. A post-mortem examination has been scheduled for Friday.
The victim’s uncle, Naseer Goraya, said the slain man’s mother and father are devastated.
"She is really, really in shock, very bad condition and she is crying a lot," he told CBC News.
"His father is really in bad shape now. He cannot get up."
Muzaffar Goraya was studying business at Humber College and worked at Air Canada.