Shantha Dodangoda, succumbed to his injuries when he along with two others were shot while erecting a stage for an election rally of Maithripala.
Deputy Minister Premalal Jayasekera, Sabaragamuwa Provincial Council member Aruna Nilantha Jayasinghe and chairman of the Kahawatte Provincial Council are wanted for questioning in connection with the death of Dodangoda.
Police have yet to make any arrests.
Deputy minister Jayasekera has already denied involvement in the shooting.