The maid I assume since it's Sunday and there would be no mail to be checked... But that would be kind of ridiculous since it could have been mail left in the mailbox.
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good point
the personal trainer killed him because no personal trainer goes to a clients house to work out.
Post the answer soon please!
It is the personal trainer. Because he was the only person with themurderedman
the personal trainer because he is supposed to train other people?
The butler. He was dusting--isn't that the maid's job?
the pool boy was cleaning the pool of blood after the murder btw why is the cook cooking near the living room 
The investigator arrested the maid for the murder. The reason for this conclusion is that none of the other individuals' alibis align with the location of the crime. The maid stated that she was getting the mail, which implies that she would have been away from the immediate vicinity of the murder. However, the other four individuals (pool boy, personal trainer, cook, and butler) all mentioned being in or near the living room, where the murder presumably took place.
Since the maid's alibi does not place her near the scene of the crime, she becomes the prime suspect. The investigator likely deduced that the murder could not have been committed by any of the other household members based on their presence in or around the living room at the time.
It's Sunday and a woman reports that her husband was murdered.An investigator comes and interviews the household(there is a maid ,pool boy,personal trainer, cook,and a butler)Each give a story of what they were doing at the time of the murder.The maid was getting the mail, the pool boy was cleaning the pool,the personal trainer was working out, cook was cooking near the living room, and the butler was dusting the living room.The investigator instantly knew who did it and arrested the culprit.Who did it?And explain why you think so.
Good Luck
(i didnt originally make this riddle)