MURDERED: Mary Yoder Part 2

The gist

Mary Yoder, a beloved 60-year-old chiropractor in upstate New York, died in July 2015 from lethal colchicine poisoning. Investigators initially suspected her husband Bill, but an anonymous letter pointed them toward their son Adam. However, digital evidence—emails, credit card purchases, phone backups, and DNA—ultimately linked 22-year-old office manager Katie Conley to the poison. After two trials, Katie was convicted of first-degree manslaughter and sentenced to 23 years, but her conviction was overturned in January 2025 on Fourth Amendment grounds, and she was released from prison.

Key takeaways

• The poisoning method: Mary ingested a lethal dose of colchicine (a gout medication) sometime on July 20, 2015, and died within 48 hours; toxicology revealed levels rising at the time of death, suggesting either a single large dose or multiple doses.

• Katie's digital footprint: The mister_adamyoder1990@gmail.com account used to order colchicine was created and accessed from the Conley home IP address; Katie's phone contained the account password ("AdamIsGay"), scanned copies of all purchase documents, deleted notes referencing the email, and searches for lethal poison dosages based on Mary's exact body weight.

• The anonymous letters: Two letters sent to police in November 2015 were typed on the office typewriter with an ink ribbon matching the letter's impressions; Katie's DNA was found under the stamp, and a draft was saved on the Gmail account and edited before sending.

• The prepaid cards: Katie admitted to purchasing the prepaid credit cards used to buy colchicine but claimed Adam used them; however, cell records showed Adam wasn't near Katie when documents were scanned to her phone.

• Motive theory: Prosecutors argued Katie—a scorned ex dating Adam on-and-off for years—poisoned Mary either as revenge or to create a tragedy that would bring Adam back to her; they cited her past fabrication of an ectopic pregnancy to rekindle their relationship.

• First trial mistrial: Despite substantial digital evidence, the jury deadlocked 10-2 for acquittal, with jurors skeptical of the circumstantial case and the defense's argument that Bill (who inherited ~$500,000, took solo hotel trips, and began dating Mary's sister within weeks) was the real suspect.

• Second trial conviction: A phone backup accidentally created on Adam's laptop—containing Katie's deleted poison research from fall 2014 onward—proved decisive; jurors convicted her of first-degree manslaughter (not second-degree murder), suggesting they believed she didn't intend to kill Mary.

• 2025 reversal and current status: An appeals court ruled the warrantless search of Katie's phone illegal in January 2025, overturning her conviction; Katie's attorney then sealed case records, inadvertently blocking prosecutors from accessing evidence needed for retrial, leaving the case unsolved on paper despite police confidence in Katie's guilt.

Notable quotes

• Investigator Van Amie to Katie: "I don't ask a question I don't know the answer to... You purchased those credit cards, didn't you?" (confronting her with bluffed surveillance footage evidence)

• Katie to investigators: "I'm afraid he put it back on me" / "I'm afraid Adam did" (suggesting Adam framed her, though later denying or remaining evasive about her own role)

• The defense's core argument (second trial): "Adam could have planted or manipulated any incriminating data... he had access to the office, to the laptops, and to Katie's devices."

Worth a full listen?

Anyone invested in forensic investigation, digital evidence, criminal procedure, or cases with genuine legal/procedural complexity should listen, as this episode illustrates how a seemingly airtight case can unravel through constitutional challenges—but casual true-crime fans may find the intricate back-and-forth between trials and appeals dense without the audio's narrative flow.