Corey Matthews enters court SASK

Corey Matthews, 36, has denied he sexually assaulted a student. (CBC)

Regina teacher Corey Matthews was in the witness box Tuesday, testifying in his own defence at his sexual assault trial and proclaiming his innocence.

Matthews denied he committed sexual offences against a former student in his class.

"Absolutely not," he told his defence lawyer under questioning.

Matthews, 36, taught at Scott Collegiate and later at Winston Knoll Collegiate but hasn't been in a classroom for the past three years. 

He's also facing a charge for being in a position of authority when he allegedly touched the same former student.

The incidents allegedly started in the spring of 2005 and continued for several years. The boy was between the ages of 14 and 17 at the time and is now 22 years old. His name cannot be published.

The man testified as a Crown witness Monday, telling court that Matthews had sex with him twice and that he was made to perform other sexual acts.

The defence cross-examined him Tuesday. At one point, the alleged victim was asked if he was a criminal, a thief and a liar. He answered yes to all three questions, but added as far as being a liar goes, it depends on the situation.

The judge-alone trial is expected to continue to Thursday.

CBC reporter Dani Mario is tweeting from the trial: