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Murder Trial: Death of a Dog Walker - what did David Campbell do and where is he now?
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Across two episodes, Death of a Dog Walker looks at the murder of former estate groundsman, Brian Low.
His neighbour and ex-gamekeeper David Campbell was later accused of his murder.
It's believed that in the seven years between him leaving the estate and Brian's death, David had been planning to kill him.
Following a 15-day trial at Glasgow's High Court, David Campbell was found guilty of murder.
Murder Trial: Death of a Dog Walker airs from August 11 on BBC iPlayer and BBC Scotland, and from August 12 on BBC Two.