Arun Singh was shot dead in Patharhut area last evening, SP Umesh Kumar Srivastava said.
"A case has been lodged against former BSP MLA Pramod Singh and seven others, including a woman Malti Singh, in connection with murder of Arun Singh," Srivastava said.
The officer said that the former MLA has been accused of hatching conspiracy.
One accused Sudeep Singh has been arrested, the SP said.
The former village head and panchayat member Singh was shot dead by some person in Gouri Bazar village in Patharhut area.