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1999: Timestamps Do Not Lie: the Software Trail That Caught Harold Shipman

Harold Shipman was a trusted family doctor in Hyde, England, who killed his patients with lethal injections of diamorphine and then falsified their medical records to make the deaths look natural. He often urged grieving families toward cremation, quietly destroying the evidence a post-mortem might have found.

What he did not understand was his own surgery computer. The practice software secretly time stamped every entry, and when investigators compared those hidden timestamps to the dates on his altered files, the lie was obvious: he had been rewriting patient histories after his victims were already dead. He went on trial in 1999 charged with just 15 murders, though he is believed to have killed close to 250 patients over more than two decades, making him Britain’s most prolific serial killer.

Shipman never confessed and maintained his innocence throughout the trial. He was convicted on all counts and later took his own life in prison.

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