03/20/2013 10:26 EDT | Updated 05/20/2013 05:12 EDT

Closing arguments heard in teacher's sex assault case

Closing arguments wrapped up today in the case of Tanya Pontbriand, a former Rosemere high school gym teacher accused of having a relationship with a 15-year-old student.

The defence called her former student a liar and a manipulator, saying he withheld details from police and at the preliminary hearing about his alleged sexual relationship with Pontbriand.

The former teacher has been in the news since 2007, when the student went to police alleging he and Pontbriand had had more than 200 sexual encounters between 2002 and 2004.

Pontbriand was charged in 2008 with sexual assault and two counts of sexual exploitation, to which she pleaded not guilty.

Her defence lawyer questioned the credibility of DNA evidence and argued a lack of proof about the relationship.

Last May, the boy’s mother testified that she became suspicious of the nature of the relationship when Pontbriand began calling and coming by their home.