Chandan Ray, who was arrested in a case of stalking, was admitted to the medical investigation room of the jail yesterday and was rushed to Deen Dayal Hospital later.
According to the police, the youth had been granted bail by Rohini District Court yesterday and was about to come out of the jail premises today.
The family of the youth alleged that they were not informed about the admission of the youth in the hospital and that he was killed.
Countering the police's claims that the accused was a "ganja addict for five years", he said that there was nothing wrong with Chandan.
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"The body had marks on his forehead and there is a deep cut under the right side of his neck. His mouth and eyes were full of blood," said Vidhyanand, a resident of Rajiv Nagar Extension in Rohini.