Devan Selvey was a quiet, gentle kid who loved his family, video games and cars, say those who knew and loved him.

Selvey was fatally stabbed Monday behind Sir Winston Churchill Secondary School where he was a student.

He was 14.

"He just wanted people to be happy," said Devan's girlfriend, Danielle Hastings, 13, standing outside Devan's mother's house Tuesday.

They'd been dating for six months she said, wiping away tears.

As many as two dozen neighbours gathered outside Devan's home Tuesday to support his sister and mother, who was away for much of the day, visiting friends and making funeral arrangements, friends said.

"He was just such a good kid," said Danielle's mom, Laurie Dennison.

Dennison said it broke her heart to see kids mourning Devan's loss.

"It's senseless," she said.

A growing makeshift memorial outside the home included flowers, notes, candles, teddy bears and a card. Two framed photos sat on a folding table.

One showed him sporting green hair. The other was of him at his Grade 8 graduation, standing next to his mom wearing a button-up shirt, tie and baseball cap and a small smile. It was taken in June.

"What happened?" a boy asked as he approached the memorial. An adult pulled him in for a hug.

A GoFundMe campaign has been established to help the family pay for funeral costs. It also claims that the victim experienced bullying and tried to get help before he was killed.

"A great kid. Bullied way too much," said Caryn Coates, the mom of a friend of Devan's who lives a few houses down from where the stabbing took place.

Shawn Wagar, Devan's best friend's dad, who was with Devan and his mom moments before he was killed, said a group of kids were bullying Devan for months. They stole his bike this summer, he said.

It remains unclear if bullying played a role in his death.

On the GoFundMe page, his older sister wrote he wanted to become a mechanic. He loved cars.

"He was my best friend and I don't know how to live without him," Karissa Selvey wrote.

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Friend and neighbour Dave Ferenc, 13, remembered Devan as a funny guy. "A comedian," he said.

Ferenc said he thought his friends were joking when they told him Devan died.

Police have arrested four people in relation to Devan's death. Two are charged with first-degree murder, while two have not yet been charged. They were all current or former Sir Winston Churchill students, police say. A fifth person was arrested Monday, but later released.

His mother witnessed the stabbing, police have said.

Asked how she was doing, friend Penny Fitzimmons said his mom is "just lost."

After school Tuesday, some students remained shaken.

"It's kind of an eerie feeling," said Daniel Andric, 15, of his day at school.

Summer Chatelain, 16, said "half the school was missing." Her younger sister didn't go to school Tuesday. "She doesn't feel safe here," she said.

After school let out, children filtered into the Lang Street townhouse complex where Devan lived, visiting the memorial, hugging adults and then running off to bike or scooter around the street.

Neighbours laughed through tears, recalling how Devan's quiet personality only shifted when he played video games.

Sometimes he got so excited, they could hear him shouting from the street.