Jail Superintendent Kulwinder Singh Thiara said Satpal (30), a resident of Jalandhar's Mehatpur village, was found dead in the bathroom of the jail's barrack.
He was brought to the jail about one-and-a-half month ago and had been sentenced to five years of imprisonment in a theft case, Thiara said.
Satpal was taken to the local civil hospital where the doctors declared him brought dead. The jail authorities handed over the body to the local police for postmortem, he said.