There was no immediate claim of responsibility, but the authorities suspected that Tamil Tiger rebels were behind the slaying.
There had been a spate of killings in the area following an unprecedented split in the Liberation Tigers of Tamil Eelam (LTTE) since March last year.
Police and security forces had stepped up security in the region for Clinton's visit.
Clinton left here Saturday after an overnight visit as the UN special envoy for tsunami relief work. He arrived in the Maldives and is expected to travel to a tsunami-hit island Sunday before heading to Indonesia. - PTI