Trace of Suspicion - Ep. 1: A Death in the Family

Summary of Trace of Suspicion - Ep. 1: A Death in the Family

by NBC News

35mMay 22, 2026

Overview of Trace of Suspicion — Ep. 1: “A Death in the Family”

This premiere episode of NBC News’ Trace of Suspicion tells the story of U.S. Marine Sergeant Todd Sommer (sometimes mis-transcribed as “Summer”), a 23-year-old husband and father who died suddenly at Camp/Miramar Marine Base in San Diego in February 2002. What initially appeared to be a natural death from heart failure later became a long-running murder investigation, driven by unusual circumstances, questions about his wife Cindy’s behavior, and the possibility that Todd may have been poisoned.

What Happened to Todd Sommer

  • Todd had been sick for about 10 days before his death, with:
    • nausea
    • vomiting/diarrhea
    • fever
    • stomach pain
    • chills
  • He had recently traveled with other Marines to El Centro and later suspected a gas-station egg roll may have made him ill.
  • On the night he died, his wife Cindy Sommer woke to him gasping for breath.
  • Cindy called 911, attempted CPR, and first responders rushed him to the hospital.
  • Todd was pronounced dead about an hour after Cindy made the emergency call.

Why the Death Became Suspicious

At first, investigators treated the case as a routine military death:

  • NCIS investigated.
  • The autopsy initially concluded heart failure.
  • Standard toxicology showed no illegal drugs or obvious suspicious substances.
  • The case was on track to be closed.

But several factors later raised red flags:

  • Todd was young and seemingly healthy.
  • His death came suddenly after a mysterious illness.
  • Cindy’s immediate comments about life insurance and military benefits were later remembered.
  • Friends, neighbors, and relatives described Cindy’s post-death behavior as unusual, including:
    • going out soon after the funeral
    • spending money freely
    • having frequent parties
    • seeing multiple lovers

Cindy Sommer’s Role and Public Perception

The episode emphasizes how Cindy’s behavior after Todd’s death became part of the suspicion around the case.

What people noticed

  • She did not grieve in the way others expected.
  • She appeared to move quickly into socializing and dating.
  • Neighbors saw lots of activity at the house and men coming and going.
  • Some interpreted her behavior as coping; others saw it as incriminating.

Cindy’s explanation

  • She says she coped by “compartmentalizing” and acting as if Todd were still deployed.
  • She also says she was overwhelmed by:
    • grief
    • raising four children
    • financial fear
    • instability after losing the family’s main income

The Investigation Takes a Turn

More than a year after Todd’s death, an NCIS review agent reconsidered the case and decided the original work had been incomplete.

Key turning point

  • The original toxicology did not test for many poisons.
  • Investigators ordered additional testing of preserved tissue samples.
  • Frozen blood, urine, liver, and kidney samples were sent to the Armed Forces Institute of Pathology.
  • That review opened the door to the possibility that Todd may have been killed by a colorless, odorless, tasteless poison.

Main Takeaways

  • Todd Sommer’s death was not fully understood at first and was initially ruled natural.
  • The case shows how routine death investigations can miss critical evidence if poisoning is not suspected early.
  • Cindy Sommer became a central figure in the case because of:
    • her financial concerns
    • her comments after Todd’s collapse
    • her social behavior after his death
  • The episode ends by setting up a larger mystery: was Todd Sommer murdered, and if so, how?

Episode Cliffhanger

The episode closes on the revelation that investigators had begun testing Todd’s tissues for poisons/heavy metals, suggesting the case was about to shift from a death investigation into a potential homicide investigation.