The head of security of former president Chandrika Bandaranayake Kumaratunge, SSP Nihal Karunarathne was yesterday sentenced to a four year jail term and was fined Rs 50,000 by the Kandy High Court Judge Preethi Padman Surasena. The judge ordered that Karunaratne be jailed for a further one year in the event of his failure to pay the fine.