A Hawaii doctor's wife testifies against him. A Dad's retrial in Mississippi. And realtor safety.

Summary of A Hawaii doctor's wife testifies against him. A Dad's retrial in Mississippi. And realtor safety.

by NBC News

32mMarch 26, 2026

Overview of Dateline True Crime Weekly (March 26)

This episode of Dateline True Crime Weekly (host Andrea Canning) covers three main beats: a Honolulu courtroom where an anesthesiologist is accused of attempting to murder his wife; a Mississippi retrial of a man accused of killing his daughter’s boyfriend with family members as key players; and a roundup of recent verdicts and a long-cold realtor murder that produced a new arrest. The episode closes with practical safety advice for real estate agents from Carl Carter of the Beverly Carter Foundation.

Hawaii trial — Dr. Gerhardt Koenig (attempted murder of his wife)

  • Case background
    • Incident: March 24, 2025, on Palipuka Trail (Oʻahu). Hikers found a woman, Arielle (Ariel) Koenig, being beaten with a rock; 911 called, attacker fled.
    • Defendant: Dr. Gerhardt Koenig, an anesthesiologist and former med school professor. Charged with second‑degree attempted murder; pleads not guilty.
    • Victim/witness: Ariel Koenig (wife), testified one year after the attack.
  • Prosecution’s version
    • The couple hiked; Ariel felt uneasy and tried to move past Gerhardt at a narrow cliff spot. Prosecutors say Gerhardt pushed her toward the cliff, pulled a syringe and vial (not recovered), then struck her repeatedly with a jagged lava rock (prosecution says ~10 blows).
    • After fleeing into the forest, Gerhardt allegedly FaceTimed his older son Emil, who saw him bloody and prosecutors claim Gerhardt confessed intent to kill his wife and expressed depression.
    • Alleged motive: marital problems and anger over an emotional/possibly flirtatious relationship Ariel had online with a married coworker, discovered via WhatsApp.
  • Defense theory
    • Ariel instigated the attack and hit Gerhardt first with the rock; Gerhardt’s actions were self‑defense and/or an attempted suicide attempt (defense says he intended to jump off the cliff).
    • The syringe/vial were never found; defense disputes severity and context of Ariel’s injuries.
  • Key testimony & evidence
    • Ariel described being shoved toward a cliff, thrown to the ground to hold onto foliage, and being told, “shut the f*** up. Nobody’s going to hear you out here.”
    • Medical imaging: no skull or facial fractures; she was discharged the day after—defense highlighted these medical facts on cross‑examination to question severity.
  • Trial status
    • Trial expected to run into mid‑April. Dr. Koenig is on the defense witness list; jurors are still deciding between competing narratives.

Mississippi retrial — Jeffrey Spence (murder of Kirby Carpenter)

  • Case background
    • Victim: Kirby Carpenter, 36, Marine Corps vet and rare metals dealer — shot and killed outside his house November 30, 2022.
    • Initial arrests: Caitlin Spence (girlfriend) and her parents, Jeffrey and Karen Spence, arrested about a year later. All initially pleaded not guilty.
    • Plea changes: Caitlin pleaded guilty to being an accessory after the fact to capital murder; Karen entered an Alford plea to accessory after the fact to grand larceny (suspended sentence/probation). Jeffrey went to trial; the first trial ended in a mistrial after jurors deadlocked.
  • What prosecutors allege
    • Prosecution says Jeffrey Spence drove from Virginia back to Mississippi to kill Kirby over money. Evidence cited: alleged discovery of Kirby’s silver coins in Jeff’s vehicle, and a witness who claimed Caitlin said at the funeral “Daddy killed Kirby.”
    • Caitlin testified that her father told her near a waterfall, “I did what I had to do” and advised her not to “look a gift horse in the mouth,” which she interpreted as a confession.
  • Defense position
    • Defense argues no physical evidence places Jeffrey at the scene, timeline issues (he’d reportedly returned to Virginia), and points to alternate suspects who had threats or motive against Kirby.
    • New defense team for the retrial has also suggested members of Kirby’s circle could be suspects.
  • Retrial details
    • Trial moved to Calhoun County to find jurors less exposed to media coverage. Opening statements: prosecution said they will prove Jeffrey’s return and motive; defense reiterated lack of direct evidence.
    • Caitlin is expected to testify again; her presence is central because video places her elsewhere at the time of the murder, so prosecutors do not allege she pulled the trigger.

Dateline Roundup — other notable case outcomes

  • Utah (Provo): Megan Sundwall trial
    • Charge: accused of murdering best friend Casey Terry (fatal insulin overdose).
    • Verdict: Acquitted of murder; convicted of assisting suicide (second‑degree felony). Prosecutors argued manipulation and control; defense argued lack of proof and potential self‑administration by the victim.
  • Hudson Valley (New York): Edward Hawley retrial
    • Charge: 2003 murder of Megan McDonald; earlier indictment and prior hung jury.
    • Verdict: Acquitted. Family statement expressed gratitude to prosecutors and relief at having an answer after decades.
  • Iowa (West Des Moines): 2011 murder of realtor Ashley Oakland
    • Development: Arrest made in 2024/2025 — 53‑year‑old Kristen Ramsey charged in connection with the cold‑case murder. Ramsey worked for an Iowa Realty subsidiary starting months after Ashley’s death. Limited details released; next court date in early April.

Realtor safety — Beverly Carter Foundation & practical tips

  • Background
    • Carl Carter (son of murdered realtor Beverly Carter) runs the Beverly Carter Foundation to train and equip realtors after his mother’s 2014 murder by someone posing as a client.
  • Practical safety recommendations
    • Verify client identity: do reverse lookups and vet clients (Forewarn recommended for phone/identity checks).
    • Meet in public first: initial meetings in public places before private showings.
    • Confirm buyer readiness: check whether the person has means/intent to buy.
    • Check phone battery and signal before appointments; be mindful of isolated properties and poor reception.
    • Use visible deterrents: ring doorbells, Alexa devices, and other cameras add surveillance/accountability and can deter attackers.
    • Discreet panic devices: wearable panic buttons disguised as jewelry or pens (example: InvisiWare) to silently summon help.
    • Resources: BeverlyCarterFoundation.org and National Association of Realtors’ safety committee for training and more tools.
  • Why it matters
    • Crimes against realtors affect men and women; incidents often occur while agents are alone, in secluded settings, or with poor cell service. Simple, consistent safety protocols can reduce risk and increase accountability.

Notable quotes

  • Ariel Koenig (testimony): “shut the f*** up. Nobody’s going to hear you out here.”
  • Caitlin Spence recalling her father: “I did what I had to do… the less I knew, the better. Don’t look a gift horse in the mouth.”

Key takeaways & next steps

  • Ongoing trials: Koenig (Hawaii) — jury deliberations continue; Gerhardt may testify. Jeffrey Spence (Mississippi) — retrial underway with Caitlin expected to testify again.
  • Recent verdicts signal nuance: prosecutors may face difficult proof thresholds (e.g., Sundwall acquitted of murder but convicted of assisting suicide).
  • Cold cases can produce late arrests when units and new detectives reexamine evidence (Iowa realtor arrest).
  • For realtors: adopt layered safety practices (identity verification, public initial meetings, tech deterrents, panic devices) and use national resources for training.

Resources mentioned in the episode

  • BeverlyCarterFoundation.org (realtor safety training)
  • National Association of Realtors — safety committee and resources
  • Forewarn (reverse phone lookup service)
  • InvisiWare (wearable discreet panic device)

If you want a quick takeaway: follow the trials for new testimony and possible defense witnesses (notably Gerhardt Koenig and Caitlin Spence), and realtors should immediately adopt basic verification and safety tech measures highlighted by the Beverly Carter Foundation.