December 06, 2018 12:00 PM

On August 8, 1980, 16-year-old Joyce McLain set out for an early evening jog in her hometown of East Millinocket, Maine, to get in shape for her upcoming high school soccer season.

When the popular cheerleader, honor student, and band member failed to return home, her concerned mother, Pam McLain, began driving around town, looking for Joyce.

Two days later, the teen’s partially-clad, bound body was found in a clearing behind the high school soccer field.

The discovery of Joyce’s remains sent Pam on an emotionally exhausting, 38-year journey to find the teen’s killer.

The decades-long mystery is examined in-depth on next Monday’s episode of People Magazine Investigates on Investigation Discovery.

The episode, “Murder Among Friends,” airs on Dec. 10 at 10 p.m. ET. (An exclusive clip is shown above.)

Joyce McClain
Courtesy Pam McLain

• For more on the brutal murder of Joyce McLain and her mother’s tireless quest to find her daughter’s killer, subscribe now to PEOPLE or pick up this week’s issue, on newsstands Friday.

Authorities interviewed dozens of potential suspects including longtime residents and outsiders to the community. But false leads, dead ends and insufficient evidence prevented them from solving the case for years.

• Want to keep up with the latest crime coverage? Click here  to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter.

Pam pressured police to keep working the case by keeping the murder in the media spotlight and even raised money to have her daughter’s body exhumed to help the investigation.

Pam McLain
AP Photo/Bangor Daily News, Denise Farwell

Her tireless effort never stopped until she found out what happened to her daughter on that warm summer evening in 1980.

“I wasn’t going to give up,” Pam tells PEOPLE.

What she found out shook Pam — and her quiet mill town — to the core.

People Magazine Investigates: Murder Among Friends airs Monday, Dec. 10 at 10 p.m. ET on Investigation Discovery.

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