The deceased has been identified as Prithvi. His body was spotted by guards in the jail number 8 of prison today. He was then rushed to hospital, where doctors declared him dead, said jail officials.
It is still unclear whether he was murdered or not, but there are signs of stab wounds on the body, they added.
"We have started the probe and waiting for his postmortem report. All the possible angles, including murder is being investigated. We are checking if he had any rivalry with another inmate," a senior officer said.
Following which, Delhi Home minister Satyendra Jain had sought a reply from officials on increasing cases of violence inside the jail premises.
In the month of May two convicts were found dead inside Tihar Jail. Of the two convicts, one was identified as Ritesh (32), serving a life sentence for murder, and the other was Amit (26), serving an eight-year jail term after being convicted of attempted murder.