Serial killer 'NO1KNOWS' managed to elude the police for years. In fact, they didn't even know he existed until, by chance, his video and audio recordings were found.Serial killer 'NO1KNOWS' managed to elude the police for years. In fact, they didn't even know he existed until, by chance, his video and audio recordings were found.Serial killer 'NO1KNOWS' managed to elude the police for years. In fact, they didn't even know he existed until, by chance, his video and audio recordings were found.