Anyone knows the answer?

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Here is one intereseting case for anyone out there to solve. The case goes like this. A Man was found murdered in his house on a Sunday morning and his wife immediately called up the police. After a while, the police arrived and start to ask the people in the house where they are at the time of the death. They answered as followed: Wife: I was sleeping at that time Maid: I was collecting mail at that time Cook: I was cooking at that time Gardener: I was getting rid of the grass at that time After hearing this, the police instantly caught the murderer, guess who is the murderer and why? Here's a chance to crack your head. Have fun