A former county prosecutor will take over the Michigan attorney general's investigation into Geoffrey Fieger's campaign finance spending.
Patrick Shannon was sworn in Monday morning as a special assistant attorney general and independent counsel.
AG Mike Cox says Shannon will be completely independent.
Cox admitted an extramarital affair last month and accused Fieger of blackmailing him unless he stopped the probe.
Fieger has acknowledged spending nearly a half million dollars on ads last year criticizing state Supreme Court Justice Stephen Markman.
The Southfield lawyer plans to run against Cox in next year's attorney general election.