German tourist Heidi Mnilk was on a two week trip to the UK. The 17 year old pharmaceutical apprentice was staying with an English family in West Wickham in south east London. On Sunday July 8th 1973 Heidi travelled to London with a friend to see the sights. Shortly before 5.00pm the pair boarded a train at Charing Cross Station to take them back to their accommodation. Heidi went to a non-smoking compartment and her friend to a carriage where smoking was permitted. Less than two minutes after the train passed London Bridge two young passengers heard screams and witnessed the neighbouring compartment's door fling open and the body of a young woman fall onto the tracks. Despite these passengers raising the alarm they were not taken seriously and it was a little while before the body of Heidi Mnilk was discovered. A post-mortem showed Heidi had been stabbed before her body was hurled from the train. The young passengers gave a detailed description of a man seen leaving Heidi's compartment and police scoured London for the suspect. Then, a few months later, information came to light suggesting a motive for the seemingly random crime.

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