Murder

Question: A woman and her daughter live in a round house. She decided to go get lunch with some friends.When she came back her daughter was lying dead on the floor of her room. She called the police. The butler said that he was cleaning up her toys. The maid said she was dusting the corners. The cook said he was preparing dinner. The police immediately arrested the murderer Who was the murderer and how did the police know who it was.

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