ROMULUS (WWJ/AP) – The chief of the Romulus Police Department plans to step down, citing health concerns about a family member.

The Detroit Free Press and The Detroit News report Michael St. Andre offered his resignation Tuesday that’s effective Sept. 27.

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The announcement comes six months after authorities searched the headquarters of the suburban Detroit agency as well as St. Andre’s home in Garden City. In March, St. Andre was put on temporary administrative leave until the probe was complete. State police and the FBI were investigating the department, but they didn’t reveal what it’s about.

St. Andre said in a statement that “being on this side of the investigation does take a lot out of you when you know you’ve done nothing wrong.”

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Romulus Mayor Alan Lambert says the investigation stems from allegations secretaries in the department were paid with drug forfeiture money.

No one has been charged.

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The Associated Press contributed to this report.