Head constable Darshan Singh, 50, was allegedly thrashed by the accused when he, along with other cops, tried to stop a fight that broke out at a restaurant in Barnala’s 22 acre market.
The police identified the deceased as Manpreet Kaur and her rumoured lover Gurdeep Singh. Kaur's father Bhola Singh and her brother Sukhbir Singh killed them, according to the police.