Anatomy of Murder The Man Beneath the Floorboards (Mark Koster)
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Jan 20, 2026 In a gripping discussion, Ben Smith, Sac County's attorney, shares the harrowing tale of Mark Koster, who was declared dead long before his remains were discovered mummified in his basement. Smith illustrates how a mysterious note and a neighbor's tip about a tall man with a Pomeranian led to uncovering the truth. As they dive into forensic details, the chilling confrontation with suspect John Green reveals a tangled narrative of self-defense and concealed crime, culminating in a conviction that left the community shaken.
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The Mysterious 'Tom' Note
- Investigators found a note on the glass door reading 'gone to Florida with Tom' listing a phone number that led nowhere.
- A neighbor later identified 'Tom' as a tall man carrying a Pomeranian, which became a key lead.
Persist With Old Phone Records
- Do dig deep into old phone records and persistently request archived data from carriers.
- Ben Smith manually scrubbed hundreds of pages and found a critical call linking the suspect to other jurisdictions.
Phone Calls Reveal Geographic Patterns
- Cross-jurisdictional phone calls can reveal transient suspects by showing patterns across states.
- A long call to a Mississippi police department helped tie John Green's movements to the timeframe of Mark's disappearance.