A soil expert has told how she helped catch the killer of Irish student Karen Buckley because dirt on his car had been missed when he had it cleaned.
Alexander Pacteau was jailed for life in 2015 for brutally murdering 24-year-old Karen after meeting her at a Glasgow nightclub.
The former private schoolboy, then 21, took Karen to his car where he strangled her and repeatedly hit her on the head with a foot-long wrench.He carried her body into his flat in Kelvindale and tried to dissolve her body in a bath of caustic soda before dumping her remains in a barrel at a farm near Milngavie, East Dunbartonshire.
Pacteau had his car professionally cleaned by a valet service after the killing in a bid to destroy evidence.But Professor Lorna Dawson told how some soil which remained on the car's tyres proved crucial in the case.
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