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Sunday morning, in a 5 star hotel, a woman was found dead in her room. The police suspected 4 people: the chef, the maid, his wife, and his police partner. The chef said: "I was cooking dinner for my residents.", The maid said, "I was doing my community service hours on cleaning the floor.", his wife said, "I was watching TV.", and his police partner said, "I was investigating to the same crime scene you were in." Who was the killer?
The chef.