Thanapalan's group of friends had been involved in a brawl with another gang.
The Canadian Press
The two groups went to a parking lot, where Thanapalan and his friends continued playing volleyball and the others entered vehicles.
"During that time, we believe there was an exchange of words," Kyriacou said.
Police don't know what was said, but the vehicles left and returned a number of times to circle a nearby cul de sac.
As Thanapalan and his friends left the parking lot around 12:15 a.m., a group of about eight males approached them, Kyriacou said.
A second group of 10 to 15 others came from the cul de sac, along a path between the school and an apartment building. They carried baseball bats, cricket bats and beer bottles, among other weapons, Kyriacou said.
Thanapalan and his friends were surrounded but some of them managed to escape. Emergency crews later found Thanapalan beaten, lying on the cul de sac. He was taken to Sunnybrook Health Sciences Centre, where he died.
One of the men involved, belonging to the party that assaulted Thanapalan, had tried to intervene and prevent the senseless attack. Police are appealing to the man to come forward and help bring some closure to the family.
Kristian Thanapalan had been accepted to study biochemistry at York University this September.
If you have any information please contact the local Police authority in Toronto. Send them an anonymous Email. The Crime-Stoppers (Toronto) tip line and website is located here.