SHERMAN, TX -- A former Grayson County Sheriff's deputy is under criminal investigation, accused of taking guns from the department.

Sheriff J. Keith Gary said at a press conference Monday that the deputy has been fired, and he expects criminal charges to be filed. The man's name has not been released. Gary declined to answer any questions, pending further investigation.

In a press release the Grayson County Sheriff's Office said a number of guns were missing from the property room although many have already been recovered.

Sheriff Gary says he believes the employee acted alone.

"The action of one employee does not represent the standards I have set from this office. This was this is a one time incident involving one employee, and I took immediate action on it," said Sheriff Gary.

The Texas Rangers have been called in to investigate. Sheriff Gary says deputies are conducting an inventory of the property room.

Gary released the following statement to reporters:

"On December 2, 2011 the Grayson County Sheriff's Office began an internal investigation on an employee for misconduct.

Through that investigation I learned that the employee was involves in criminal activity.

I immediately requested that the Texas Rangers conduct a criminal investigation.

Texas Ranger Brad Oliver interviewed the employee and received enough information to substantiate the criminal complaint.

The employee has been terminated and the investigation in ongoing.

The actions of one employee does not represent the standards I have set for this office. This is a onetime incident involving one employee I took immediate action on. I ask the public to continue to trust and have faith in the employees of the Sheriff's Office. We will continue to serve and protect the citizens of Grayson County as we have in the past."