Who is the murderer ???

 It was a busy Friday for inspector.

That time his telephone rang. 

Postman of that area was calling and he said that he has found a dead body of the old man who was living alone. 

Inspector reached the spot. 

Inspector observed 2 packets of milk and  yesterday 's newspaper laying in front of the house.

It was obvious that before postman,  milk delivery man and newspaper man had come to house. 

Inside the house, old man was strangled to death. 

Inspector made a note of all these and arrested the murderer.

 Who is the murderer  ???

Answer 

Newspaper delivery boy is the murderer  !!!!

Inspector has observed that there were 2 packets of milk but only one copy of newspaper. 

Thinking that milk man arrives after newspaper man. 

Yesterday,  newspaper boy came near house pretending to deliver newspaper. 

That time he killed the old man. 

But milk delivery man was unaware of this and delivered the milk. 

Old man could not take milk as he was already dead.

Newspaper boy had killed him by that time. 

Next day milk man who is unaware of all this, had delivered the milk..

But newspaper boy knew it already that old man was dead, (( he himself killed him )

Didn't take the trouble of delivering the newspaper   !!!!