A 24-year-old individual was killed after a group of persons attacked a family at their residence in Monroviya Watta, Rathgama last night.
Police Media Unit said about five persons who arrived at the location had attacked the victim, his wife, brother and parents.
All the family members were admitted to the Karapitiya Teaching Hospital with serious injuries.
The 24-year-old victim, who had been severely beaten, later succumbed to their injuries.
Police suspect that the attack had been motivated by a long-running dispute. The attackers have been identified and have fled the area. Rathgama police are conducting investigations to arrest them.