Police on Tuesday closed the investigation into Ya'acov Borovsky, head of the anti-corruption unit in the state comptroller's office, which began late last year.
Accusations of bribery were dropped without an indictment, while the investigation into breach of trust allegations was closed due to a lack of sufficient evidence.
Borovsky was accused of trying to bribe former prime minister Ariel Sharon to appoint him chief of police by promising to ease up on a criminal investigation being conducted against him.
A senior police official who was close to Borovsky allegedly made the offer in his presence to Solomon Karubi, a Likud Central Committee member who was close to the prime minister's son, Omri.
Dan Izenberg contributed to this report.