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In Ice Cold Blood Bonus: Rounds On The Ground Provide Clues About Gunman (Season 2, Episode 15)

Pat McCarrick, a retired captain with the St. Charles Police Department, said he noticed that along with several spent rounds found on the ground of the crime scene, some live round were also discharged from the murder weapon. This meant that there was either an issue with the firearm, or the shooter was simply inexperienced.