# How an Empty Coffee Cup Solved Lindy Sue Biechler’s Murder 47 Years Later

Page: https://stenobird.com/podcast/forensic-files-unsealed-6989771/how-an-empty-coffee-cup-solved-lindy-sue-biechler-s-murder-47-years-later
Text version: https://stenobird.com/podcast/forensic-files-unsealed-6989771/how-an-empty-coffee-cup-solved-lindy-sue-biechler-s-murder-47-years-later.md
Podcast: [Forensic Files Unsealed](https://stenobird.com/podcast/forensic-files-unsealed-6989771)
Published: 2026-09-04T19:29:29+00:00
Episode link: https://www.spreaker.com/episode/how-an-empty-coffee-cup-solved-lindy-sue-biechler-s-murder-47-years-later--74907739
Audio file: https://dts.podtrac.com/redirect.mp3/api.spreaker.com/download/episode/74907739/a_coffee_cup_caught_lindy_biechler_s_killer.mp3
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Duration seconds: 1892

## Resource

This episode recounts the decades-long investigation into the 1975 murder of Lindy Sue Biechler, a teenager found stabbed in her Pennsylvania home. Although the case remained unsolved for over forty years, investigators eventually utilized modern genetic genealogy to identify a former neighbor, David Sinopoli, as the primary suspect. Detectives finally secured a breakthrough by surreptitiously collecting Sinopoli's DNA from a discarded coffee cup at an airport. This forensic evidence linked him to the crime scene with nearly absolute certainty, leading to his arrest and subsequent guilty plea in 2023. The narrative highlights the persistence of law enforcement and the evolution of forensic technology in bringing closure to a cold case. This episode includes AI-generated content.

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## Transcript

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