How Did a Healthy Chiropractor Die Within 48 Hours?

In July 2015, Mary Yoder seemed like a picture of health. The 60-year-old chiropractor walked into her practice in Whitesboro, New York, ready for another day of work. Within 48 hours, she was dead. Her sudden death shocked everyone who knew her. Initially, doctors suspected a rare infection might have been responsible for her rapid decline. However, when toxicology results came back months later, they revealed something far more sinister than any natural illness. Mary had died from a massive overdose of colchicine, a prescription medication she had never been prescribed. Colchicine is not an over-the-counter drug that people casually have access to. The amount found in her system far exceeded any therapeutic dose, pointing clearly toward poisoning rather than accident or illness. Her husband of nearly 40 years, Dr. William Yoder, initially presented himself as a devastated widower. However, his behavior in the months following Mary's death began raising serious questions among family members. Most notably, he rapidly entered into a new romantic relationship with Mary's own sister, a move that struck many as deeply inappropriate and suspicious. As investigators in Oneida County began their work, they started piecing together the circumstances surrounding Mary's death. The investigation gradually shifted from a medical mystery into a full murder inquiry. A turning point came when an anonymous letter arrived, accusing someone close to Mary of the poisoning. This letter proved to be a crucial development that redirected the entire investigation. When detectives followed up on the anonymous tip, they made a discovery that fundamentally changed the direction of the case. Evidence found in a Jeep emerged that no one had anticipated, adding a new layer of complexity to the investigation. What had begun as an inexplicable medical event quickly evolved into a case that divided both the family and the broader community. The death of a respected community member raised difficult questions about trust, motive, and the lengths someone might go to. This episode represents Part 1 of Crime Junkie's coverage of this case, hosted by Ashley Flowers and Brit Prawat. Together they unravel how the anonymous letter redirected investigators and explore the unexpected evidence that turned suspicion in an entirely new direction.