Initial investigation has revealed that the youth was drunk at the time of the incident.
He fell from the staircase and sustained serious injuries, a police official said today.
"It seems that he succumbed to the injuries he sustained in the fall. We have moved the body for postmortem. It will reveal the actual cause of death," said a police official.
A case has been registered and further investigations are on, police said.
On Wednesday night, a 33-year-old PhD scholar from Manipur was found brutally murdered with his neck slit with a knife in south Delhi's Kotla Mubarakpur area.
Another 23-year-old youth hailing from Manipur was found dead under mysterious circumstances at his home in South Delhi's Malviya Nagar yesterday.