Nikodin Tiru of Dolohat tea estate killed Salu, who was a traditional medicine practitioner and beheaded him with an axe at Phulbari No:1 Sarang village.
Tiru then took the severed head and walked with it to Dolohat police outpost where he surrendered.
Tiru claimed during interrogation that he was suffering from mental problems and had approached Salu in November last to cure him but there was no improvement in his condition.
He further alleged that Salu was planning to take away his land and other property following which he had killed him in a fit of rage, the police said.