Who is John Peek & Where Is He Now? 2026 Update & Background

NBC’s Dateline episode Deadly Omission examines the crimes of John William Peek, a Georgia man whose actions connected three murders across two decades. The episode places Peek at the center of a case that began with suspicion, stalled for years, and ultimately concluded with a rare resolution that tied together multiple cold cases.

Peek’s story is not presented as a single crime, but as a pattern that emerged over time. Investigators, prosecutors, and victims’ families slowly uncovered how omissions, misdirection, and calculated decisions allowed him to evade accountability for years before justice was finally reached.

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Early Life and Public Image

John William Peek was born in 1952 and raised in Georgia. By outward appearances, he led a stable and successful life. He performed well academically, completed college, and secured a position in the information technology sector at Lockheed. Friends and colleagues viewed him as intelligent, capable, and dependable.

This public image played a key role in shielding him from early suspicion. Peek maintained steady employment, social connections, and the appearance of a conventional family life. Nothing in his background suggested a propensity for violence, which later complicated efforts by investigators to build a case against him.

Marriage to Carol Marlin and the 1996 Murders

Peek married Carol Marlin, a program planner, and the couple appeared to live a comfortable life in Marietta, Georgia. In the weeks leading up to her death, Peek persuaded Carol to change the beneficiary of her life insurance policy, removing her mother and naming him instead. The policy totaled seven hundred thousand dollars.

On June 13, 1996, Carol Marlin and her close friend and former coworker, Margaret Ginn, were found bludgeoned to death inside Ginn’s home. The crime scene showed no signs of forced entry and no property was missing. Investigators noted signs of staging, including a torn Lockheed invoice placed in Carol’s hand with another coworker’s name written on it, an apparent attempt to deflect suspicion.

Investigation Stalls and Lingering Suspicion

Police quickly focused on John Peek as a person of interest. His alibi placed him away from the scene, and he claimed his marriage to Carol was stable. He also pointed investigators toward a threatening letter Carol had received shortly before her death, suggesting an outside suspect.

Despite strong suspicions, authorities lacked direct physical evidence. The case relied on circumstantial details such as the insurance change and inconsistencies in Peek’s statements. Without sufficient proof, prosecutors could not bring charges, and the murders of Carol Marlin and Margaret Ginn went cold, leaving their families without answers.

A Second Marriage and Escalating Behavior

In 1999, Peek met Kasi Peek, a divorcee, and the two married in May 2000 after a brief courtship. At first, the relationship appeared stable, but it later deteriorated. By 2004, Peek was involved in an extramarital relationship, and Kasi moved out, though she remained hopeful about reconciliation.

During this period, Peek continued to manage financial matters closely. Investigators later identified patterns in his behavior that mirrored the events surrounding his first wife’s death. These similarities would only become clear after another tragedy occurred.

The Murder of Kasi Peek in 2005

On October 2, 2005, Kasi Peek was found shot to death in her Smyrna, Georgia home. The scene appeared staged, with signs of a break in and no forced entry. Peek contacted authorities and claimed he had been working at his home in Allatoona at the time of the murder.

Detectives noted parallels between Kasi’s death and the 1996 murders. As the investigation progressed, Kasi’s family filed a civil lawsuit, which led to increased scrutiny of Peek’s financial dealings and personal history. This renewed attention reopened the earlier cases and allowed investigators to reexamine evidence through a broader lens.

Arrest, Plea Deal, and Sentencing

In October 2005, John Peek was arrested in connection with the murders of Carol Marlin, Margaret Ginn, and Kasi Peek. Facing overwhelming evidence that linked all three deaths, he entered into a plea agreement rather than proceeding to trial.

In April 2007, Peek pleaded guilty to the three murders. He received three life sentences, to be served concurrently, without the possibility of parole. The plea brought long-delayed closure to families who had waited nearly a decade for accountability.

Where John Peek Is Now

John William Peek remains incarcerated in the Georgia Department of Corrections. He is serving his life sentences at Wilcox State Prison in Abbeville, Georgia. Under the terms of his sentence, he is not eligible for parole.

His case stands as an example of how persistence by law enforcement and families can uncover buried truths, even after years of silence. While justice arrived late for the victims, the resolution ensured that Peek would never regain his freedom.