07/26/2012 05:35 pm ET Updated Jul 27, 2012

Melanie Melanson Missing: Search For Teen Who Disappeared In 1989 Heats Up Again

An anonymous tip injected new hope into missing person case that's been unsolved for almost 23 years.

Melanie Melanson went missing in Massachusetts five days before her 15th birthday in October 1989.

Now, CBS reports that an unnamed caller to private investigators prompted authorities to schedule a search of the Middlesex Fells Reservation in Stoneham on Saturday.

Fox News notes that there have never been any suspects in Melanson's case.

Jessica Pastore, a spokeswoman for the Middlesex County district attorney's office, told Fox that Melanson is presumed dead.

"We're hopeful that we can find Melanie and give her the proper burial that she deserves," said Pastore, adding, "We know who was with Melanie the night she disappeared."

The tipster said her body might have been moved to the reservation.

Melanson was last seen with two teenage boys after a party in the woods, the family has previously said.

The Boston Globe reports that the search for Melanson will be aided by Dr. Bill Bass, a forensic anthropologist who founded the University of Tennessee’s Anthropological Research Facility. He specializes in researching the decomposition process.

Missing Children