An old man lives alone in a flat

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An old man lives alone in a flat. Because of his age , he is not able to move comfortably and hence most of the things used to be delivered to his house.

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 ?

Click here for Answer

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.