Gordon Letanik is a key member of staff at the Washington museum the President is about to visit, and provides Myka Bering with her first close encounter with the supernatural.

Wikia W13 - Dr. Letanik and the Bloodstone
An Aztec Bloodstone he's cleaning cuts his finger, and through the bond of blood takes control of him, forcing him to attempt a ritual of virgin sacrifice. The designated target is the Mexican Ambassador's daughter, and it is only through Myka's swift intervention that he fails to commit this murder. His further fate is never revealed, although presumably Mrs. Frederic and the Regents would not wish incidents like this to go to trial and draw unnecessary attention.