Kuldeep Mishra (21), an accused in a triple murder case, was lodged in barrack number 42 of the jail since October 2011, they said.
Other accused in the murder were Jeevan Lal, Soney Lal, Kamlesh and Omprakash, who were also lodged in the same barrack.
Family of the victim has alleged involvement of the four other inmates in Mishra's death.