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In this episode of the Scalpel and Sword podcast, host Dr. Lee Sharma welcomes Heather Packer, a nurse and true‑crime enthusiast, to dissect the 1992 murder of Rachel Nickell in Wimbledon Common. The conversation uses the case as a vivid illustration of anchoring bias and confirmation bias in investigative work. The police fixated on Colin Stagg after a superficial suspect description, employing entrapment tactics and ignoring contradictory evidence, which led to his wrongful conviction and the eventual loss of two additional lives when the real killer, serial offender Robert Napper, was later identified through DNA analysis. Sharma draws parallels between this investigative failure and medical diagnostics, emphasizing how premature anchoring on a diagnosis can harm patients. He introduces his SPARK framework (Stop, Pause, Ask, Don't assume, Reflect, Respond, Keep moving forward) as a tool for handling high‑stakes conflict in healthcare settings. The episode also contrasts the London investigation with the more methodical Idaho 4 case, highlighting the importance of humility, curiosity, and systematic evidence gathering. Throughout, the hosts stress learning from past mistakes, fostering supportive professional relationships, and applying the lessons of bias awareness to both clinical decision‑making and everyday conflict resolution.

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