On Friday while delivering the mail , postman feels something suspicious in the flat and tries to look inside through the key hole and he saw a blood filled body of the old man.
CID arrived the scene.
On the outside of flat , he found two bottles of warm milk , Tuesday newspaper, some unopened mails , some gifts.
CID waste no time to find the murderer.
Who was the murderer ?
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Newspaper delivery man was the murderer because of absence of Wednesday and Thursday missing newspaper.This indicates he already know that there is no one to read it.