"Sushant Das tried to hang himself with a blanket given to him. However, a guard saw him and rushed to the barrack to get him down," Superintendent of Central Jail Gopal Tamrakar told PTI.
He said Das was out of danger and a case of attempt to suicide was registered against him.
Das was arrested for allegedly abducting and murdering the NRI doctor couple's son Ishan (9) on June 22 last year.
Police suspect that Das was upset as the couple refused him job in a local hospital, which was set up with their partnership, and allegedly kidnapped Ishan and killed him to take revenge.