Kirby Glynn Smith was a teacher at a McKinney ISD middle school at the time of the sexual abuse, police say.

Update 12:04 p.m. with an updated statement from Van Alstyne ISD.

The assistant principal of Van Alstyne Middle School was arrested Tuesday on a charge of continuous sexual abuse of a child, Collin County jail records show.

Kirby Glynn Smith, 50, was arrested after a juvenile male came forward with allegations against the principal, said McKinney police in a statement released Wednesday afternoon.

Police said the abuse happened while Smith was a teacher at Cockrill Middle School in McKinney. They didn't reveal if the child was one of his students.

Authorities said there aren't any other known victims at this time.

In 2012, Smith was named Cockrill Middle School's teacher of the year. Smith taught sixth-grade mathematics while employed with the district, according to a video posted on McKinney ISD's YouTube page.

In a post on its Facebook page, Van Alstyne Independent School District said Smith is "no longer employed" with the district and is not allowed on the district's property.

"We want to protect our kids and we are going to take precautions to make that happen. We are cooperating with McKinney police," said Superintendent David Brown.

Brown also told WFAA that there were no red flags on Smith's work file that caused any alarm at the time.

Van Alstyne is north of McKinney.

Smith's bail is set at $500,000.

Police have asked anyone with information pertaining to the case call 972-547-2710.

McKinney ISD released the following statement on Wednesday:

"It is with a heavy heart that we acknowledge McKinney ISD received a report from the McKinney Police Department that a former employee, Mr. Glynn Smith, was arrested on a charge of sexual abuse of a child. We were deeply disturbed and saddened by the news that a former teacher in our district may be involved in the abuse of a child. We believe our number one priority is maintaining the safety and security of our students. Due to the fact that this is an ongoing investigation we have very little information at this time. We will provide additional information when it becomes available."

Editor's note: A previous version of this story stated Smith was the principal of Van Alstyne. This has been corrected to assistant principal.