The Uttar Pradesh Police had said on Saturday that it would invoke the stringent National Security Act and Gangster Act against those accused in the killing of the 46-year-old man.
Amar Dubey, who carried a reward of Rs 25,000, was killed in an encounter in Maudaha village in Hamirpur district.
Unidentified gunmen shot and seriously injured a member of the upper-caste Thakur community.
