From the Chicago Tribune:

John Harris, the last chief of staff to former Gov. Rod Blagojevich, pleaded guilty today to a single count of wire fraud in federal court. He agreed to cooperate in the federal probe against his former boss in return for a recommended prison term of just under 3 years.

Harris was accused of aiding some of the former governor’s efforts to leverage the powers of his office in exchange for favors and campaign contributions. Among the accusations against Blagojevich is that he attempted to sell the U.S. Senate seat vacated by President Barack Obama.

From the plea agreement:

From approximately October 2008 to on or about December 9, 2008, in the Northern District of Illinois, Eastern Division, Defendant, together with co-defendant Rod Blagojevich and others, participated in a scheme to deprive the people of the State of Illinois of their intangible right to the honest services of Defendant Rod Blagojevich, in violation of Title 18, United States Code, Sections 1343 and 1346.

So the circle closes in on the former governor.