Marianna Riossi is former supply teacher at the York Catholic District School Board based in Vaughan. ^{[undefined] [undefined] [1]}

Riossi had been working as an occasional supply teacher at St. Theresa of Lisieux Catholic High School since 2014. She is listed as a teacher in good standing with the Ontario College of Teachers. ^{[undefined] [undefined]}

Riossi has been certified to teach since 2012.

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In February 2016, Riossi was charged with three counts of sexual assault and sexual exploitation over an alleged affair with a male student. ^{[undefined] [undefined] [1]}

She allegedly became involved in a sexual relationship with the student, between October and December of 2017 last year.

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She will appear in Newmarket court on March 6, 2018. ^{[undefined] [undefined]}