#77: Dead Old Man

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Answer to #76: It was the only World War at that time and World War 2 had not started yet. So, the sword should have been engraved with the words "World War" instead of "World War 1".
It was called World War 1 only after World War 2 started.

An old man lives alone in a house. Because of his old age, he is not able to move comfortably, and most of his things are delivered to his home.

On Friday while delivering the mail, the postman saw something suspicious in the house and tried to look inside through the key hole. He saw a body covered in blood and realized it was the old man.

The police arrived at the scene. On the outside of house they found two bottles of warm milk, Tuesday newspaper, some unopened mails and some gifts.

Who killed the old man and how did the police know who to arrest? [Slide for answer]

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