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It’s unclear what type of drug led to Kotval’s overdose or where she obtained the drug from. The family’s statement said her death was the result of taking a pharmaceutical drug of unknown origin.

Tributes to the girl flooded social media with a #GreenforChloe hashtag on Twitter. Students at All Saints and across the city responded by wearing green on Wednesday and pink on Thursday, Kotval’s two favourite colours. All Saints’ student council issued a statement saying “the loss of any student, particularly in so tragic a manner, greatly wounds us all.”

“Everybody knew Chloe. In the halls, everyone would say hi to her,” said Analis Therien, 14. “Everyone loves her. She’d laugh at everything you said. She was so sweet.”

Kotval called Therien Sunday afternoon around 2 p.m.

“I was actually the last person to talk to her,” Therien said. “She was happy. She asked me to come over, but I couldn’t. She told me how her day was. And as she was leaving she said, ‘You’re my best friend,’ and I said, ‘You’re my best friend, too.’ She said, ‘I miss you.’ I said, ‘I miss you, too’ and I said, ‘I love you.’ She said, ‘I love you more.’ And that was it.”

Therien was shocked to learn Tuesday afternoon that Kotval had died. Her close friends spent the day in the school chapel.

“It was very quiet,” she said.

She was shocked, too, to learn her friend had died of an overdose.

“Everyone’s wondering how it got there and who gave it to her.”

Mardi de Kemp, manager of communications for the Ottawa Catholic School Board, said grief counsellors were at the school and will remain on hand for as long as needed. Ottawa police confirmed they became involved with the case on Feb. 12, but would give no other details. The investigation remains open but at this point the death is not considered a criminal matter, said Const. Marc Soucy.