TV Guide BBC Scotland Tuesday

Dunfermline Athletic v St Johnstone (Kick-off 7.45pm). Coverage of the match at KDM Group East End Park. St Johnstone are looking to win the title, while the Pars look set to finish in the play-off places, but it was Dunfermline who claimed a 1-0 win when the teams last met at McDiarmid Park in January

The discovery of human limbs in Loch Lomond by police divers on a routine training exercise was followed eight days later by a severed head washing up on Barassie Beach near Troon, with the victim identified as 18-year-old Barry Wallace from Kilmarnock. This documentary follows Strathclyde Police's investigation into the murder, with Detective Superintendent John Geates appointed senior investigating officer

A nationwide hunt is launched following the disappearance of prime suspect William Beggs, while police delve into his upbringing in a small village in the Northern Irish countryside. He was part of a Baptist congregation and a community centred on traditional and morally conservative principles, and an incident from his youth that was an early indicator of the violent path he took in adult life is explored

Julie Wilson Nimmo and Greg Hemphill travel along the River Tay, beginning with a dip in its estuary at Broughty Ferry, where they join the Dundee Dookers, a group of men who find open-water swimming helps their mental health. At Kenmore, they go for a dip with their actress friend Sally Reid, who has been swimming in the river since she was a child, then relax in a spa on the shore of Loch Tay