Karla Homolka served a dozen years in prison in the rape and murder of teens Kristen French and Leslie Mahaffy in Ontario, and authorities say she and her husband also drugged, raped and murdered Karla's 15-year-old sister Tammy.
Several parents told the Montreal Gazette they became aware of Homolka's involvement with their school only after a man, who called himself a concerned citizen, passed out leaflets to parents in March.
"She is not a regular volunteer, and can never be alone with any children, either in school or churches".
The school has confirmed that Holmolka was asked to come in by a teacher for a show-and-tell class about knitting, while on another occasion she brought in a dog.
The Seventh-day Adventist Church school mentioned nothing specifically about Homolka in a statement, but said it heard the concerns about the reports and nobody with a criminal record can volunteer on school grounds.
"As I said, she is not a regular volunteer".
The school has since issued a statement on the matter: "The Quebec Conference of Seventh-day Adventists and the administration of Greaves Adventist Academy are committed to providing quality education and enriching learning experiences to its students". On Wednesday morning, she parked her black Honda SUV in front of the photographers, and rushed her three children inside the school.
Karla Homolka reportedly volunteered at a primary school in Notre-Dame-de-Grâce, according to a report by Breakfast Television and CityNewsnews.
Still, Tim Danson, an attorney for the a lawyer who represents the families of Kristen French and Leslie Mahaffy, told The Canadian Press that the news of Homolka enjoying days at school with her children is troubling. Homolka can also never be alone with the children.
"I think she's unsafe and I certainly wouldn't take the chance with my kids to be around her", he added.
This week, the 47-year-old, who has three children from her second marriage, was pictured leaving Greaves Adventist Academy in Montreal.
Homolka has been bouncing around since she was released from prison.
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