He had been planning to kill the old man for more than a week, the reason being he didn't like the old man's eyes, and the planning was step by step, thinking of various ways to make everything work. It began with observing the various behaviors of old men when they encountered people or events during the day. He would do good to the old man so that the old man would not have doubts about him. But every night, this crazy man would observe the old man's sleeping habits, which lasted for a week and required a lot of patience. Finally, on the eighth night, he killed the old man. The evidence was collected well, showing that he had prepared well, but in the end, it may have been because he had an offense, which caused him to be worried, causing him to confess to the police.
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