A Man Was Found Murdered On Sunday Morning Riddle Answer

Have you seen the viral riddle on the internet about a man found murdered on a Sunday? Here's the riddle and the answer.

Here's the riddle: A man is found dead on a Sunday morning. His wife calls the police immediately. The police question the wife and staff. They all explained where they were, and what they were doing. The wife said she was in bed reading a book, the cook claimed she was cooking breakfast, the gardener said he was planting seeds, the maid claimed she was getting the mail, the butler claimed he was polishing the silver. The police immediately arrested the murderer.Who was the murderer?

Here's the answer:

***Please note there is a few different versions of this riddle on the internet. However, the answer is always the same.***