Hunting the Pembrokeshire Murderer

Pre-order now – Publishing 26 October 2026

John William Cooper is one of the UK’s most violent serial offenders. Dubbed the ‘Bullseye Killer’ by the press, he terrorised West Wales, operating under the radar, unnoticed and therefore unhindered by police, for almost two decades. He was eventually brought to justice in 2011.

For the first time, Hunting the Pembrokeshire Murderer tells the complete story of how this prolific career criminal and ruthless killer was unmasked. S.J. Matchett, a detective involved in the original investigation, recounts the details from an insider’s perspective, shining a light on the extreme lengths, tactics and methods employed to catch Cooper long before the cold case review which saw him convicted. This is not the story you know; as well as piecing together the complicated jigsaw that linked Cooper to his most notorious crimes, S.J. presents known facts of other cases, never before discussed in the public domain, leaving the readers to decide whether Cooper might also be guilty of other crimes.