The psychological horror story

This is the story of a man who lived with an old, always cared him, but the old man was missing an eye and the man he raged that vision. Until one day he decided to kill him, and then cut it into pieces and bury under the wood floor. 
One day the police went to the house and asked the old man, he got nervous because they felt the heartbeat of the old, and it was thought that the police also felt, went crazy and ended the confessed the murder.