Episode Summary
How do detectives turn fragments of evidence into a case that catches a killer?
In this gripping episode of The Security Circle, Yoyo welcomes former police detective Alan Cotton, who worked on the investigation into the murder of Barry Wallace, known as the Limbs in the Loch case.
Alan takes us inside the painstaking work behind the investigation: the hours spent examining footage, the courage of a key witness, and the forensic discovery that connected Barry to the killer’s home. His recollections reveal how seemingly small details can carry extraordinary weight.
“That last wee piece of the jigsaw, a little nugget. It often comes from somewhere you least expect it.”
This is also a candid conversation about the craft of detection, the changing role of forensic science, and why patient, persistent police work matters.
“DNA was the icing on the cake… DNA has become the whole cake now.”
Beyond the evidence, Alan reflects on inspirational leadership, the detectives whose difficult work rarely receives recognition, and the remarkable dignity of Barry’s family.
For true crime listeners and anyone fascinated by how investigations unfold, this episode offers a firsthand account of the clues, decisions and people behind a major murder inquiry.
Listener advisory: This episode discusses murder, dismemberment and distressing details of a criminal investigation.