Jefferson County officials say an audit found just over $104,000 missing from the treasurer's office in fiscal year 2013.
Sheriff Craig Doolittle asked the state Justice Department to investigate. Treasurer Patty O'Neill has resigned. No charges have been filed.
Justice Department spokeswoman Anastasia Burton confirmed Wednesday that the Division of Criminal Investigation was asked to investigate and determine if any money was taken.
There is no phone listing for Patty O'Neill in Boulder.