An old man lives alone in a small house. Because of his age, he is not able to move easily and has to have many things delivered to his house.

The postman was delivering the mail on Friday and felt something suspicious in the house. He looked through the key hole to investigate. Upon looking through the hole, he saw the dead body of the old man.

Police arrived the scene.
On the outside of the house, they found two bottles of warm milk, Tuesday's newspaper, some unopened mail, and some gifts.

They immediately found the murderer.

Who was the murderer?












Answer: The mailman. He knew not to deliver the newspaper from Wednesday and Thursday because he killed the man on Tuesday.