Nauni Ram (45), who was serving life sentence since 2006, committed suicide yesterday, Jail Superintendent A K Rai said.
He said that body had been sent for post-mortem examination.
Rai claimed that Ram was mentally disturbed for the last few months and was being treated at a district hospital.
He said that two police personnel -- Kailash Chand and Dheeraj Singh -- have been suspended on charges of laxity.