In January 2019, Lee Pomeroy boarded a train along with his 14-year-old son. Another man was also on the train – Darren Pencille. Shortly after they boarded, Pencille clashed with Lee and some angry words were exchanged, Pencille pulled out a knife and violently stabbed Lee in the neck and torso, 18 times in 25 seconds. Tragically, Lee died in his son’s arms, before the train reached the next stop. Pencille is a paranoid schizophrenic and had a history of not taking his medication, this along with the fact this all happened in the middle of the day lead many to question not only their safety on public transport but whether this could have been prevented.

Nikki Mitchell, BBC South Home Affair Correspondent, joins Dermot Murnaghan to discuss what went wrong.

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