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After his 17 year old son Charlie was fatally stabbed, dad Martin Cosser made a solemn double promise - he would secure justice and devote the rest of his life to tackling knife crime.
Charlie was killed by 16-year-old Yura Varybus at an end-of-term celebration on June 23, 2023, in a farmhouse in West Sussex. Medical staff fought desperately to save his life but tragically, Charlie died two-and-a-half days later in hospital.
His father Martin shared his anguish on TikTok , and now the account of how the murder case went viral is being featured in the second series of ITV1's TikTok: Murder Gone Viral.
In devastating scenes, viewers will witness Charlie's younger sister Eloise remember how police arrived at the family home during the night.
She recalled: "I woke up to