Episode 4 - The Gun

Examines the possible motive put forward by the police after 18 years for Alistair Wilson's murder. The police say new witnesses have come forward and they are investigating fresh leads.

Alistair Wilson's son, Andrew, now aged 20, speaks publicly about his father’s murder for the first time. What was said and how likely is it to unearth new leads?

The police investigation and looks at theories about the murder. Summarising what we know and what we don't know about the case.

The impact of the murder on the Wilson family and how the seaside town of Nairn deals with the unsolved crime.

The gun used in the killing, and possible links with Poland. Also that more advanced DNA testing is being carried out on the murder weapon.

This features BBC Scotland presenter John Beattie’s account of a tip-off made to him about the Alistair Wilson case while he was working on his lunchtime radio programme.

Examines new details about the envelope handed to Alistair Wilson by his killer shortly before he was shot.

The events of 28 November 2004, when Alistair Wilson was fatally shot three times on the doorstep of his home in Nairn.

A behind the scenes look at the investigation into the Alistair Wilson murder, one of Scotland’s most baffling unsolved cases. Subscribe today.