The deceased has been identified as Pranav Tiwari, a native of Rewa district in Madhya Pradesh, they added.
Tiwari was living with his three batchmates -- Dheeraj Pandey, Devender Patel and Vivek -- in Munirka, police said.
When Pandey and Patel returned at around 9 pm, they found the door locked from inside.
He was taken down and rushed to the Fortis Hospital where he was declared brought dead. No external injury was found on the body, police said.
As per his batchmates, he was suffering from depression, they said, adding the investigation is underway.
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