NEW YORK - Aug. 9, 2024 -- Oxygen, the home of high-quality, true-crime programming, travels back to 1984 when the dairy industry began the somber task of posting missing children on product packaging, which was ubiquitous in homes across America.

"The Girl on the Milk Carton" delves into the story of one of the first faces to be featured, 12-year-old Jonelle Matthews, who vanished and left behind a cold case that would echo through decades until an unlikely hero brought forth evidence crucial to solve it.

The two-part series airs Sunday, Aug. 25 at 7 p.m. ET/PT.

Five days before Christmas 1984, Jonelle Matthews disappeared from her family home in the small town of Greeley, Colo. With her family devastated and the community shaken by fear, Greeley police turned to the FBI for help. As leads ran cold, a determined grassroots movement emerged, refusing to let Jonelle be forgotten. Their tireless efforts caught the attention of the White House, prompting President Ronald Reagan to shine a national spotlight on Jonelle's fate and champion the missing children's national milk carton campaign in the hope that one day Jonelle would find her way home.

For 35 years Jonelle's disappearance remained one of Colorado's unrivaled cold cases. In 2019, a grim discovery 20 miles from her home changed everything: Jonelle's remains were unearthed, transforming a missing person case into a murder investigation. While this development finally offered answers, it also confirmed the heartbreaking truth the family had long feared but never wanted to face.

Two decades before Jonelle's remains were found, Angela Hicks was living with a dark suspicion.

Her then-husband, a true-crime enthusiast and Idaho gubernatorial candidate, had exhibited behavior that made her believe he was involved in Jonelle's disappearance. Despite Angela's efforts to prove her suspicions, her story went unheard for years. It wasn't until a former classmate of Jonelle's sister, now a detective, was assigned to the cold case and vowed to solve it that Angela's secret came to light.

In a reckoning like no other, Angela bravely came forward to share her story, breaking free from 20 years of silence and fear. As the Matthews family's quest for justice hung in the balance, Angela's testimony proved crucial in uncovering the long-hidden truth.

Exclusively on Oxygen, told in two-parts:

"A DEVASTATING DISAPPEARANCE" (Aug. 25 @ 7 p.m. ET/PT)

Days before Christmas 1984, 12-year-old Jonelle Matthews vanishes from her home. As shock grips Greeley, Colo., local detectives turn to the FBI, President Reagan and a national milk carton campaign for answers. All along, the truth lies closer to home.

"A MONSTER REVEALED" (Supersized 75-minute episode; Aug. 25 @ 8 p.m. ET/PT)

Nearly 35 years after Jonelle Matthews' disappearance, a chilling discovery reignites the hunt for her killer, whose secrets are finally unmasked. An unlikely hero comes forward and a historic trial forces a reckoning.

"The Girl on the Milk Carton" is produced by Wild Dream Films. Stuart Clarke executive produces with Marcus Plowright serving as director and showrunner.

ABOUT OXYGEN TRUE CRIME

Oxygen True Crime is a multiplatform crime destination for women. Oxygen True Crime remains one of the fastest-growing cable entertainment networks with popular original programming, including the flagship "Snapped" franchise, "Cold Justice," "Killer Relationship with Faith Jenkins" and breakout event specials such as "The Pike County Murders: A Family Massacre," "Selena & Yolanda: The Secrets Between Them" and "Murdered and Missing in Montana." The network had its best year ever in 2023 in total viewer cable rankings in Total Day and Press Prime thanks to one of cable's most-engaged audiences. Oxygen True Crime's over-the-air platform recently launched in select US markets. Oxygen True Crime is part of NBCUniversal's Entertainment portfolio, which includes NBC, Bravo, E!, Oxygen True Crime, SYFY, Universal Kids, USA Network and Peacock. For more information, visit oxygen.com.

About Wild Dream Films

Wild Dream Films is a multi-award-winning, Emmy Award-nominated production company based in the UK. Led by Stuart Clarke, Wild Dream Films has been producing international content for over 30 years. The company's portfolio includes collaborations with major broadcasters across the US and international markets, such as NBC, National Geographic, BBC, Warner Bros. Discovery, Channel 4, and the History Channel. Wild Dream Films is known for bringing cinematic visuals and entertaining storytelling to a truly global audience.