Siddharth, 19, was the son of former education minister of Manipur M Okendru, they said. He had come to Delhi to pursue studies and was staying in Safdarjung with his siblings.
Around 4.10 PM yesterday, the police were informed that a man fell from the terrace of the restaurant, said a senior police officer.
He was rushed to a nearby hospital where he died during treatment, he said.
Siddharth's sister has alleged a foul play in the incident.
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Siddharth had consumed alcohol and went to the terrace and tried to climb the wall to go towards the adjacent restaurant, said the officer.
A waiter saw him and asked him to come down and he obliged, he said.
However, later he went back and fell through a gap in the railing. His head hit the pots on the ground floor and he was injured. Locals rushed him to a hospital where he died, the officer said.
Police said they were scanning the CCTV footage to determine the sequence of events that led to his death.