The investigation of a man suspected of illegally accessing a federal database to benefit Republican gubernatorial candidate Bob Beauprez has been referred to the U.S. Attorney for Wyoming.

Cory Voorhis, an agent for the U.S. Immigration and Customs Enforcement agency, has been under investigation in the suspected leaking of information on illegal immigrants arrested in Denver. That information was used by Beauprez in a series of TV attack ads against Gov.-elect Bill Ritter.

The Colorado Bureau of Investigation conducted a joint investigation of the leak with the FBI. That investigation is largely complete, and the U.S. attorney in Wyoming will decide whether to press charges.

The case was given to Wyoming authorities because Voorhis had worked with the Colorado U.S. attorney on several cases, creating a possible conflict of interest for that office.