A conman made the horrifying decision to drink acid in court after being told he was going to prison. Mark Marshall, who was born Mark Castley and went by a number of aliases, once posed as an ex-MI6 spy to dupe the family of disgraced footballer Adam Johnson out of £170,000. He died after smuggling a corrosive substance past security into Inner London Crown Court where he was being sentenced for a new fraud offence in April 2019. An inquest heard he likely smuggled the substance into court in