David Campbell, 77, gunned down Brian Low, 65, on February 16 2024 (Police Scotland/PA) - A former head gamekeeper found guilty of murdering an ex-colleague with a shotgun has been refused leave to appeal against his conviction. David Campbell, 77, killed Brian Low, 65, on February 16 2024, having previously disabled CCTV cameras at his home in Aberfeldy, Perth and Kinross, in an attempt to conceal his whereabouts.