Jack Colby was the husband of Gina Colby. Jack Colby was a former policeman and close friend of Tom Barnaby. They became Sergeants at the same time, but Jack decided to stay as uniformed Sergeant, while Tom went to become Detective Sergeant. Later Jack quit as a police officer and became a parole officer in Midsomer Holm. Jack Colby was murdered in order to prevent him from revealing the truth about the murder of Maria Godbold, Lady Holm


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