Quora: Did Leo Frank really kill Mary Phagan?
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By Mark Sims, Los Angeles, CA. Senior Quora Researcher (2011–present) · Last updated on Quora Caption: Counsel for State and Defense in hot argument before Judge Roan. Did National Pencil Company superintendent Leo Frank really kill Mary Phagan in 1913? Yes, Leo Frank killed Mary Phagan and we know this to be the case to a mathematical certainty, when we combine forensic evidence, testimony from an accessory-after-the-fact, and Leo Frank’s reversal of his alibi where he places himself at the scene of the crime, when the rape-murder took place. I will explain this in more detail in the forthcoming answer