13 Year Old Realizes His Twin Brother Is A Killer In The Middle Of Interrogation

Summary of 13 Year Old Realizes His Twin Brother Is A Killer In The Middle Of Interrogation

by Stephanie Soo

36m•July 19, 2026
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Overview of 13 Year Old Realizes His Twin Brother Is A Killer In The Middle Of Interrogation

Stephanie Soo continues the two-part deep dive into the Cart twins case, where 64-year-old Denise Tenpenny was sexually assaulted and murdered in her home, and investigators were left with a difficult forensic problem: the DNA matched identical twin 13-year-old brothers, Hunter and Levi Cart. Because identical twins share the same DNA profile, police had to rely on physical evidence, phone data, searches, and the brothers’ separate interrogations to determine who was involved. The episode centers on the psychological tension of the interviews, especially the moment when one twin begins to realize the evidence is pointing overwhelmingly at the other.

Case Background

The crime

  • Denise Tenpenny was found murdered in her bed.
  • The scene included DNA evidence, but the match was complicated because it led to both identical twins across the street.
  • Investigators believed only one twin was actually involved, but they needed non-DNA evidence to distinguish between them.

Family reaction

  • The twins’ mother, Becca, and father, Kyle, are brought to the police station and are desperate for answers.
  • Stephanie frames Becca as a genuinely involved and caring parent who had tried to get her sons therapy and supported them emotionally.

Key Evidence Against Levi

Physical evidence

Investigators reportedly found:

  • Levi’s watch under Denise’s body
  • A green nitrile glove piece at the scene, plus a matching box of gloves in Levi’s closet
  • Bloody L.L. Bean boots in his room
  • A brown leather journal in his nightstand with disturbing writings, including:
    • “I will kill you”
    • “KKK killer”
    • a page about balancing on one leg, which the host suggests may relate to Levi’s mobility/disability

Digital evidence

Levi’s phone activity raised major red flags:

  • Messages saying things like:
    • “I have very low empathy”
    • “My plan, I’m on track”
    • “Found my MO”
  • Screenshots and searches about:
    • serial killer methods
    • strangulation
    • how long it takes to strangle someone
    • Ted Bundy’s diagnosis and “kill kit”
    • the Fairfax, Ohio police department
    • juvenile detention and police interrogation tactics
  • He also sent a TikTok message saying he was “probably going to get caught,” then deleted it.

Behavior in interviews

  • Levi repeatedly tried to appear both naive and overly analytical.
  • He denied clear explanations but also offered speculative alternatives, such as:
    • blood transfusion theories
    • “maybe somebody put my blood in that house”
    • the possibility of more than two people being involved
  • He also made an especially telling statement:
    • “I don’t think murder is stupid.”

Hunter’s Interrogation and Realization

Hunter initially defends Levi

Hunter is shown as visibly distressed and defensive, insisting:

  • Levi could not have done something like this
  • Their family has trauma, therapy, and open communication
  • Levi is “smart” and not the kind of person who would make such a mistake

What breaks Hunter’s confidence

Investigators present him with:

  • Levi’s watch
  • the knife evidence
  • the DNA findings
  • the other circumstantial evidence from Levi’s room and phone

Hunter becomes increasingly overwhelmed and begins to emotionally unravel, but he still struggles to fully accept that his twin could be the killer.

What Made This Case So Difficult

The twin DNA problem

  • Identical twins made standard DNA testing far less useful.
  • Investigators had to build the case using:
    • digital forensics
    • physical evidence
    • behavior during interviews
    • inconsistencies in Levi’s statements

Stephanie’s commentary

Stephanie argues that:

  • the investigators may have struggled tactically in the interview
  • the defense likely would have had significant room to challenge the case at trial
  • the plea deal may have been influenced by those legal complexities

Outcome

  • Levi Cart pleaded guilty on November 10, 2025 to:
    • aggravated murder
    • aggravated burglary
    • strangulation
  • He received the maximum sentence allowed under juvenile law
  • He will remain in juvenile detention until age 21
  • He is expected to be released in 2033

Main Takeaways

  • This case shows how identical twin DNA can create major forensic obstacles.
  • The conviction relied heavily on digital evidence, physical evidence, and Levi’s own disturbing online behavior.
  • Hunter’s interrogation is emotionally central because it captures the moment he seems to realize his twin is likely responsible.
  • Stephanie’s closing view is that the investigation was strong enough to pressure a guilty plea, but not airtight enough to be ideal for trial.

Notable Themes

  • Childhood trauma and its possible psychological effects
  • The limits of DNA evidence in twin cases
  • Online behavior as a modern investigative goldmine
  • The emotional devastation of discovering a sibling may be a murderer