The incident took place at Mangalapur village as an elephant went wild without provocation and trampled its mahout Triloki Raut (40) to death, Kalyanpur police station in-charge Manzar Alam said.
The body has been sent for post-mortem, he said, adding a forest team has been called to bring the pachyderm under control.
The slain Mahaout, a native of Katariya village, had come to Manglapur village with the elephant for a marriage ceremony, the police officer said.