Sopan Pagare (26), a resident of Malegaon and presently an undertrial in a murder case, attacked two prisoners with a wooden stick while they were asleep in their barrack at around 1am over a petty quarrel they had before they went to sleep, jail superintendent SY Karnik said.
Sopan got up around midnight, removed a wooden stick from the toilet and attacked Vishal Balasaheb Choudhari (28) and Vijay Ippar (22) while they were sleeping.
Both the prisoners sustained serious injuries in the attack and were rushed to Nashik civil hospital where Vishal succumbed to his injuries this morning, police said.
The other injured prisoner is undergoing treatment at the hospital.
Karnik said the Nashik Road police have registered an case of murder under section 302 of IPC against Pagare.
All the three prisoners had earlier been booked in murder cases at different police stations and they were lodged in the jail following their judicial custody since a long time, he said.
The trial in the murder case in which Choudhari was an accused was to begin from October 24 at Nashik court, he said.