Mentally retarded Madan Khara (40), a former samiti member of Chitrakonda, had allegedly attacked Biswajit Sarkar of Malkangiri village number 101 with an iron rod two days back," Aniruddha Samantary, inspector-in-charge of Malkangiri police station said.
Biswajit was severely injured and hospitalised. The villagers were infuriated when they learnt that the mad man had attacked and seriously injured Biswajit.
The villagers tied him to a tree and beat up to death, Samantary said adding that two persons - Rabi Sarkar and Deba Sarkar - were arrested yesterday in connection with Khara's killing.
The two were produced before a local court which remanded them to judicial custody.