Shannon Gallagher: Teenager, 15, kills herself two months after "suicide" of her younger sister

Teenager, 15, kills herself two months after 'suicide' of her younger sister, 13, who was targeted by cyberbullies | UPDATED: 15:38 GMT, 15 December 2012 A teenager took her own life less than two months after her 13-year-old sister killed herself. Shannon Gallagher, 15, from Co Donegal was found on Thursday by foster carers she had been placed with, hours after telling them that she was going to bed.