“Deadly Omission”: Dateline Unravels a Chilling Georgia Mystery January 25 2026

NBC’s Dateline presents a harrowing episode titled “Deadly Omission”, airing January 25, 2026, at 7/6c. Reporter Andrea Canning guides viewers through a haunting investigation that spans nearly a decade, connecting the 2005 murder of Kasi Peek in Smyrna, Georgia, with the long-unsolved 1996 slayings of Carol Marlin and Margaret “Maggie” Ginn in nearby Marietta. What begins as a tragic but isolated case evolves into a revelation of a deeply buried truth — one that exposes a calculated killer who lived a double life.

The episode follows how investigators and grieving families uncovered the disturbing common thread among the cases: John Peek. The man once seen as a devoted husband would ultimately be revealed as a master manipulator whose violent actions left a trail of loss across two generations.

• Who is John Peek & Where Is He Now? 2026 Update & Background
• Who was Kasi Peek & What Happened to Her? 2026 Update & Background
• Who was Carol Marlin & What Happened to Her? 2026 Update & Background
• Who was Maggie Ginn & What Happened to Her? 2026 Update & Background
• “Secrets in the Ashes”: Dateline Reports on Patricia Leigh Mills Homicide January 24 2026
• “The Breakup”: Dateline Reports on LaNell Barsock Homicide January 24 2026

The Murder of Kasi Peek: A Crime That Shook Smyrna

On October 2, 2005, police in Smyrna responded to a distressing call from John Peek, who reported discovering his wife, Kasi Peek, murdered in her condo. She was just 39 years old. At first glance, the scene appeared to be a home invasion. Furniture was overturned, belongings scattered, and the entire space gave the impression of a robbery gone wrong.

However, Smyrna detectives immediately noticed inconsistencies. There was no sign of forced entry. No valuables were missing. To seasoned investigators, the scene felt staged. The appearance of chaos seemed artificial, as if carefully constructed to mislead. These red flags prompted authorities to look deeper into John Peek’s past — and what they found would reopen two cold cases from a decade earlier.

A Shocking Connection to 1996: The Murders of Carol Marlin and Maggie Ginn

In June 1996, friends Carol Marlin and Maggie Ginn met for dinner in Marietta, Georgia. Both women were later found dead, their murders sending shockwaves through the community. The crime scene bore eerie similarities to Kasi Peek’s: no forced entry, nothing stolen, and a staged appearance. Investigators suspected foul play, with some suspicion falling on Carol’s husband, John Peek. Still, they lacked physical evidence and leads ran dry.

The 1996 case eventually went cold, remaining unsolved for nearly a decade. But when John Peek revealed during questioning in 2005 that his previous wife had also been murdered, Smyrna detectives began connecting the dots. The likelihood of one man losing two wives to homicide under similar suspicious circumstances was statistically improbable — and deeply troubling.

Families and Detectives Refuse to Let the Case Die

The families of all three victims played a critical role in keeping the cases alive. Kasi Peek’s relatives, devastated and desperate for answers, began pushing for deeper investigation. Her sister, Jaquidon Kruger, described a transformation in John Peek’s demeanor, calling him “a monster.” Meanwhile, investigators worked tirelessly to uncover evidence tying him to all three crimes.

One relative even agreed to wear a wire during a conversation with Peek in hopes of eliciting incriminating information. The emotional weight of that decision highlighted the desperation and courage of families seeking justice after years of pain and uncertainty.

For detectives like Eddie Herman, who had worked the Marietta case in 1996, Kasi Peek’s death reignited a fire to find the truth. The similarities between the cases were no longer just coincidence. Herman and his colleagues were convinced that a single person had orchestrated the murders — and they were determined to hold him accountable.

A Master Manipulator Behind the Facade

John Peek lived what many considered a respectable life. He held a good job, maintained friendships, and kept up the appearance of normalcy. But beneath the surface, authorities discovered a man capable of deception, manipulation, and murder. Investigators described him as “diabolical,” someone who could compartmentalize his crimes and blend into society.

Peek’s ability to present as charming and trustworthy allowed him to avoid suspicion for years. His victims, all women close to him, were betrayed by someone they believed cared for them. His second wife, Kasi, never knew the full truth about his past. And in Carol Marlin and Maggie Ginn’s case, it took nearly ten years for anyone to uncover the link between their murders and the man they thought they knew.

Justice, Delayed but Delivered

Eventually, with growing evidence and testimonies, John Peek was arrested and charged in connection with the murders. The road to justice was long, filled with procedural setbacks and emotional hurdles. But thanks to persistent law enforcement and the unwavering resolve of the victims’ families, the truth came to light.

The trials brought painful memories to the surface but also offered closure. Peek was found guilty and sentenced to life in prison, bringing an end to his years of freedom and deceit. The verdicts confirmed what investigators and loved ones had feared — that these murders were not random acts, but deliberate choices made by a manipulative killer.

A Final Reflection

Dateline’s “Deadly Omission” offers a sobering reminder of how evil can sometimes hide in plain sight. The episode presents a clear, methodical breakdown of how three women’s lives were stolen by a man who escaped accountability for nearly a decade. Andrea Canning’s reporting underscores the importance of persistence in solving cold cases and the power of intuition in the pursuit of justice.

As Canning noted, the story is also a lesson in listening to one’s instincts — and those of trusted friends. Through meticulous storytelling and interviews with those closest to the case, Dateline ensures that the voices of Carol Marlin, Maggie Ginn, and Kasi Peek are heard and remembered. Their legacies live on in the determination of those who refused to let their stories be forgotten.