For five years Dennis Nilsen seduced and murdered young boys in his home before disposing of their body parts in the most gruesome ways.
Finally, the twisted serial killer was caught because of his own complaining after he moaned to his estate agent that the drains outside his North London flat were blocked.
Secretly, Nilsen was fully aware of the sickening reason that the drain was blocked - and ultimately the complaint would be his downfall.
When Nilsen and the other tenants voiced their frustrations about the smell being produced, the landlord sent clearage company Dyno-Rod to visit the property.
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