A 64-year-old high school teacher from Vaughan has been charged with sexually assaulting a student.

On Feb. 23, York Regional Police opened an investigation after receiving information about a teenage student who was reported to have been sexually assaulted by a teacher.

The accused has been working as a high-school science teacher with the York Catholic District School Board at a high school in Markham since 1989.

The accused's name is listed in the website staff directory for Thornhill's St. Robert Catholic High School and he is listed as a teacher at that school on RateMyTeachers.com.

Investigators want to ensure there are no additional victims and are asking anyone with information to please come forward.

Frank Defina, 64, of Vaughan, is charged with two counts of sexual assault and one count each of sexual exploitation and sexual interference.

The accused will appear before the Ontario Court of Justice in Newmarket on March 21.

St. Robert is the same school where a student alleged he was sexually assaulted by former vice-principal Paul Paterson in 2015. Paterson was acquitted of those charges in June 2017. He still faces a disciplinary hearing with the Ontario College of Teachers over the allegations.