Fifty-eight-year-old John Armstrong, better known as Jack, worked as a cab driver in south Wales. On October 5th, 1979, he alerted the taxi company that he’d picked up a fare at a pub in Cardiff. It was the last time anyone heard from him.
Hours later, his cab was found abandoned near the Waterton Industrial Estate in Bridgend. The interior was splashed with blood.
Three days later, on October 8th, John’s body was found on Cowbridge Common, eleven miles from where the car was discovered. He had been repeatedly bludgeoned in the head.
Authorities were operating on the assumption that John was murdered in the course of a robbery, and their investigation was thorough and wide-ranging. However, no arrests were made, and the case very quickly went cold.
In 2020, the inquiry was reopened in the hopes that DNA evidence might help bring John’s killer to justice. However, as of this writing in December 2024, the slaying of John Armstrong is still unsolved.
Crime Immemorial 
They had an incomplete DNA profile in 2020. Couldn’t genetic genealogy be helpful in such a case?