How did Dr Harold Shipman get caught?

The coroner was alerted to the unusual Death Rate of Shipman's patients by a local Funeral director and the local crematorium in March 1998. He was questioned but the police found insufficient evidence of any wrong doing. He killed a further 3 patients including the former Mayor of Hyde, Kathleen Grundy in June and he forged a will leaving himself £385,000. Grundy's daughter was a lawyer and her solicitor was suspicious about the will, so she informed the police. Shipman was found to own a typewriter of the same model that was used to type the will. When Grundy's body was exhumed it was discovered to contain a high level of Diamorphine. This added up to a lot of circumstantial evidence against Shipman.

Further investigations revealed that he had altered records of his visits to patients on his Computer, making it appear that he had visited them earlier than the day that they died. This was the first tangible evidence of any misconduct by Shipman.