A brave mum who lost her teenage son to depression has issued a plea for other young Scots to speak out about their mental health.Letitia Farrell told how her loving son David had lost his fight for life in hospital on June 5 after being found at his home in Penilee, Glasgow, three days before.The 18-year-old, who was described as a “brother” to many, had shared a haunting post about depression on his social media page just hours before being discovered.Heartbroken mum Letitia believes her son’s death was a “tragic accident” and a “cry for help” that went terribly wrong.In a direct appeal to those currently suffering, the 41-year-old urged other young people to talk about their feelings so no other family has to go through the same.