The man has been identified as a one Mohommad Nisam, a resident of Mullipuram, Puttalam.
The man and his son had been sleeping in their house and the son had later complained to the police that his father has been murdered.
Upon arriving at the scene, police have found that the man has bled heavily. They have also found a rock near his head.
Further investigations have revealed a sharp knife at the bottom of a well located nearby. Bloodstains were also found near the well.
Further investigations are underway.