David O'Sullivan who went missing in the US while hiking the Pacific Crest Trail on April 7, 2017 Mrs O'Sullivan and her husband Con, from Midleton, Co Cork, last heard from their son on April 7, 2017. "Every day I wake up and think, 'Please God, let today be the day they find him'," she said. "It's the not knowing that's torture. You're always hoping and always waiting. "His friends have moved on, they have girlfriends now or they're getting engaged. "He's missing family moments and milestones that he should be here to celebrate. "All his clothes are still here, even his books and his games."