He was taken to hospital where he died of his injuries.
Shifting nervously in his chair at the family's dining room table, the teen told CTV News Toronto that he couldn't stop replaying different scenarios in his head after hearing about Selvey's death on Monday.
They appeared in court on Tuesday morning to answer to first-degree murder charges and were read a list of 26 names they were not allowed to contact. Det.
Sgt. Steve Bereziuk said that investigators are looking into bullying as a factor in the investigation into Selvey's death.
A third suspect was also arrested later in the day but was released unconditionally after being questioned by police. One is female and the other is male. Two 16-year-olds, a boy and girl, were arrested and have since been released.
The knife used in the attack was found in the area of the homicide scene by Hamilton police Tuesday morning. "Everyone with love in their hearts is invited and will be welcomed", event organizers wrote on social media.
After the fatal incident on Monday, the mother said she wanted to go public with the details of her son's bullying experience.
Bereziuk said that authorities have video of the incident.
"There is a relationship between the victim and the suspects", he said, adding that the nature of the relationship can not be divulged in order to protect the identity of the suspects as they are youths.
A mother who witnessed her son being stabbed to death outside his high school broke her silence on Wednesday, blaming the system for failing to protect the 14-year-old from the "bullies" she said made his first month of school a nightmare.
She did not say if such a call was what brought her to the school Monday afternoon, but said she has yet to come to terms with "the horror" she witnessed firsthand. "I've cried to the principal and nothing was done", she said.
Devan was being bullied, according to his mom, who said the family was trying to get the school and the Hamilton-Wentworth District School Board to address the abuse since the beginning of the school year and that despite policies around bullying there's no accountability.
He was a "sweet" 14-year-old kid who liked vintage cars, video games and his family.
"As a board, we will also conduct a formal review of our Safe Schools practices when the police and school investigations are complete", he said in an emailed statement Wednesday.
Photos of Devan sit among stuffed animals, flowers and messages of support at a makeshift memorial outside the 14-year-old's Hamilton home.