Brent Ashcroft | WZZM13.com

ADA — The disappearance of Deanie Peters 35 years ago has become one of the longest-running mysteries in west Michigan.

Peters of Cascade vanished on the evening of Feb. 5, 1981. She was attending her brother William's wrestling practice at Forest Hills Central Middle School in Ada.

During the event, the 14-year-old told her mother she needed to use the rest room. Deanie walked across the gymnasium floor, exited through the doors and was never seen again.

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Local law enforcement and residents spent days combing through wooded areas near the school and around the Ada/Cascade area, but nothing was ever found.

Authorities received many tips and interviewed several possible suspects, but the case eventually went cold.

Peters was officially declared dead in 1991.

The Kent County Metro Cold Case Team reopened the case in 2008 and started the entire investigation from scratch. They reinterviewed hundreds of people, pursued investigative subpoenas, and traveled to seven different states, following clues and leads, but the dead ends continued.

The primary suspect in Deanie's disappearance is Bruce Bunch, who lived in Lowell in 1981.

Bunch, who had relocated to Somerset, Ky., died in early 2008 before he could be interviewed. The Cold Case Team that reopened the Peters' investigation was launched four months later.

Cold Case members say they have pin-pointed people living in the Ada-Cascade area who know what happened to Deanie Peters, and where her remains are, but they continue to not cooperate with authorities.

"The only thing I can say is, if you know anything, please come forward and let us know because we'd like to bury our daughter, know where she is and know what happened to her," Mary Peters said in 2012. "I don't know what else to say, just that I wish that they would come forward because somebody knows something."

For the past five years, WZZM has maintained the Deanie Peters: WZZM 13 Investigates Facebook page.

The page has been active since spring 2011 and has close to 4,000 followers, who openly discuss the case, and share memories of Deanie.

Along with thousands of comments, you'll also find photo galleries, letters Deanie wrote and even a copy of her official death certificate.

Cold Case detective Sally Wolter said they continue to actively pursue leads in the Peters' case.