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MURDERED: Mary Yoder

In the summer of 2015, Mary Yoder, a healthy 60-year-old chiropractor, went to work as usual. Later that day, she began feeling sick. Within two days, she was dead. At first, her sudden decline seemed like a medical mystery. But investigators soon uncovered evidence of poisoning, launching a murder investigation that divided her family and the community. As questions mounted, grief quickly gave way to suspicion. Subtle details about Mary’s final days, conflicting information about her diagnosis and unexpected decisions in the aftermath left some of her loved ones uneasy. When authorities realized critical findings had not been fully reported, a full investigation began in earnest, raising new questions about Mary’s final hours.

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Timeline:

July 20, 2015
July 20, 2015
Afternoon

Mary Yoder becomes suddenly ill while working at her chiropractic office, experiencing nausea, vomiting and abdominal pain.

Around 6 p.m.

Mary finishes seeing her last patient and goes home, where she continues to be sick throughout the night.

July 21, 2015
July 21, 2015
Around 9 a.m.

Bill Yoder drives Mary to the hospital as her condition worsens.

Around 10 p.m.

Mary’s condition sharply declines after initially seeming stable. She falls in the bathroom and is moved to the ICU.

July 22, 2015
July 22, 2015
4:17 a.m.

Mary’s heart stops for the first time. She is revived.

Just after 10 a.m.

Mary goes into cardiac arrest again and continues to code arrest multiple times.

2:54 p.m.

Mary Yoder is pronounced dead after being revived seven times.

September 2015
September 2015

Toxicology testing determines Mary died from colchicine poisoning.

October 2015
October 2015

Sharon contacts the Oneida County Sheriff’s Office and learns there is no open investigation into Mary’s death. Authorities then open a case.

November 20, 2015
November 20, 2015

Two anonymous letters are postmarked alleging that Adam Yoder poisoned his mother with colchicine and hid the bottle in his Jeep.

November 23, 2015
November 23, 2015

The anonymous letters are received by the Oneida County Sheriff’s Office and the medical examiner’s office.

December 8, 2015
December 8, 2015

Investigators interview Adam Yoder.

Detectives search his 1991 Jeep Wrangler and find a small glass bottle of colchicine under the front passenger seat, along with a receipt tied to an email account in his name.

Mid-December 2015
Mid-December 2015

Investigators interview Kaitlyn Conley, the office manager at the Yoders’ chiropractic practice and Adam’s ex-girlfriend.

Chiropractic Office, Utica, New York

The former location of the chiropractic practice co-owned by Mary and Bill Yoder, where Kaitlyn Conley worked as the office manager.

The Yoder Residence

The approximate location of where Bill was on the night of July 21, 2015, when hospital staff were unable to reach him and state troopers were sent to wake him.

Oneida County Sheriff’s Office

The law enforcement agency that received an anonymous letter in the case.

Hospital, Utica, New York

Where Mary Yoder was admitted after becoming violently ill. She was later moved to the ICU where she died.

We’d love to speak with you and see how we can support.

If you’re a law enforcement agency or family member of one of the people we mentioned in this episode, or if you’re looking for more coverage on a case, please reach out. You can email us at:

Episode Source Material

  • Original reporting by Nina Schutzman

  • Oneida County District Attorney records

  • Oneida County Sheriff’s Office records

  • Oneida County Court records

  • facebook.com/FreeKaitlynConley

  • ABC News Studio (9-20-2024) Accessed 12-5-2025
    Little Miss Innocent: Passion. Poison. Prison.

  • Cleaver, Jolene. “Conley Stoic as Guilty Verdict Read.” Observer-Dispatch, 6 Nov. 2017. Accessed 5 Dec. 2025.

  • “Family Split on Kaitlyn Conley’s Conviction of Mary Yoder’s Poisoning Murder.” Crime Watch Daily, 21 Mar. 2018. Accessed 5 Dec. 2025.

  • Little Miss Innocent: Passion. Poison. Prison. ABC News Studios, 20 Sept. 2024. Accessed 5 Dec. 2025.

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