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Doug Keyes made no comment as he left the courthouse Monday. (CBC)

The trial of a high school principal from the Annapolis Valley has been postponed until Friday after three witnesses failed to show up in court.

Before it was delayed, Doug Keyes entered a guilty plea for a charge of breach of trust. He said he's not-guilty of the accusations of sexual assault.

Keyes, a principal at Avon View High School in Windsor, was facing 10 charges including sexual assault, sexual touching and the breach of trust. The charges stem from a complainant who said he was victimized by Keyes in 1998.

Monday morning, Keyes admitted to committing breach of trust between August 1, 2008 and July 11, 2011. No details of the charge will be released until it's registered into the court by the Crown on Friday.

The Crown then dropped the non-sexual assault charges in the case.

The prosecution then asked for a adjournment until Friday because the complainant and two other witnesses were not in court.

Keyes is on paid administrative leave until the case is heard.

His trial is being heard by judge alone. Keyes made no comment as he left the court Monday.