GRANDVILLE, MI -- A nude woman who exited an upright tanning booth at Planet Fitness had good reason to think something wasn't right in the private room she was in.

Standing there on May 12, the woman noticed someone moving in the ceiling area. She would soon learn a 27-year-old man was spying on her, police say.

That man, whom police have identified as Cody Postmus, of Jenison, has since been charged with surveilling an unclothed person.

Court records shed further light on what allegedly happened in the private room at Planet Fitness that day.

"While standing naked in the room, she noticed dust falling from the ceiling. She looked up to see an unknown male looking down on her through the grated ceiling panels," a detective said in sworn statements made in court for Postmus' arrest.

Postmus allegedly fled on foot from the Planet Fitness location, 3845 Rivertown Parkway, near the RiverTown Crossings mall. He was later identified through the woman's verbal description, surveillance camera images and customer ID records, a probable cause affidavit filed in Grandville District Court shows.

Postmus allegedly admitted to a Grandville Police detective, during a follow-up interview, that he had indeed entered the ceiling area with intent to "observe the victim while nude."

He remains in police custody. Bond has been set at 10 percent of $25,000.

State Police records show a previous 2009 conviction of misdemeanor obscene disorderly conduct. Postmus pleaded guilty to that count in Ottawa County.