A 13-year-old Vancouver boy is dead and a 14-year-old is in custody after a Saturday night brawl turned deadly.

Police said Sunday the fight occurred over a girl, and that victim Chris Poeung wasn't even directly involved.

"It was a school yard type fight outside of the school and weapons came out and tragically we have a 13-year old boy dead and a 14-year old in custody that's facing charges of manslaughter," said Const. Tim Fanning of the Vancouver Police Service.

"It was a very tragic day yesterday, and hearts go out to all involved in this case, both the victim's family and suspect's family ... it's a horrible event to see happen."

About 10 people were involved in the fight and another 30 were present. Virtually all were between the ages of 13 and 15, making them too young to hold a driver's licence.

A knife got pulled, and four teens ended up being stabbed. Three remain in hospital with non-life-threatening injuries.

Cathy Le, Chris's girlfriend, told CTV Vancouver that she was there with him, and that everything happened really quickly.

I turned around to see him there was a blood on the heart side, he looked at us, gave us a grin and he fell," she said.

"I just started crying and called 911." 

Police arrived quickly. They sealed off the parking lot and began interviewing witnesses. A few blocks away, they arrested two suspects who were riding a bus.

Poeung, in Grade 7, attended a different school than the suspect.

Cathy said Chris was a very nice guy who was easy to talk to. "It's so hard to believe. I feel like it's still a dream, a dream, I'll wake up tomorrow and he'll be there," she said.

With a report from CTV British Columbia's Carrie Stefanson