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b'In January 1979, Tan Kuen Chai and Tan Mei Ying returned from their job operating a school bus to find their four children dead in the bathroom of their Singapore apartment. There was no forced entry, nothing was stolen, and evidence that the murderer cleaned up after themselves all indicated that this was a carefully planned kill. Who could have done this and why?\\xa0\\nLearn more about your ad choices. Visit podcastchoices.com/adchoices'