Catherine McFerran, centre, mother of Neil McFerran, with Katrina Davidson, left, mother of Aaron Davidson, and the North's Health and Safety Minister Arlene Foster, at the launch in Stormont of a campaign highlighting the dangers of carbon monoxide. Teenage friends Neil and Aaron died of carbon monoxide poisoning in August of this year after a gas leak in an holiday apartment they were renting overlooking the Atlantic in the holiday village of Castlerock, Co Derry.