The FBI is investigating a $200,000 severance deal given to former Wayne County development director Turkia Mullin.
Michigan Attorney General spokesman John Sellek confirmed Tuesday that the FBI is looking into the deal.
Sellek said Attorney General Bill Schuette "has full faith in the FBI to conduct a thorough investigation."
Mullin received the payout after leaving her old job to take over as chief executive of Detroit Metropolitan Airport. The county owns the airport in Romulus, 10 miles west of Detroit.
Her new job pays $250,000.
Wayne County faces a $160 million accumulated budget deficit.
Mullin originally said she would not return the money, but changed her mind following a call with County Executive Robert Ficano.
Ficano said last week that protocol was not followed in approving Mullin's severance.