Baijanth, brother of the MLA, was arrested at Nawadih and produced before the court of judicial magistrate (First Class), Tenughat, while four others - Meghlal Puri, Kailash Puri, Jitendra Puri and Suraj Puri - surrendered before the court.
All the five, who are charged with IPC sections 302 (murder) and 134 (abatement to such assault, if the assault is committed), were remanded to 14 days judicial custody.
Two more accused named in the FIR, JMM MLA Jagannath Mahto and Kewal Puri have not been arrested.
Asked about the delay in arrest of Mahto, Superintendent of Police Jitendra Singh said the police were looking into some technical aspects and enquiry report.
According to the FIR lodged by the victim's brother Anand Pandey, Santosh Pandey (22) was beaten up at a 'jan adalat' (people's court), convened by a group of people at Narah village. He died in a hospital.