Abesh Dasgupta was found in a pool of blood in the ground floor of the apartment complex.
The city police on Monday constituted a Special Investigation Team (SIT) to probe the death of a teenager at the apartment complex of noted author Amit Chaudhuri where he had gone to attend a birthday party.
A grievously injured Abesh Dasgupta, a Class 12 student, was found in a pool of blood in the ground floor car park of the apartment complex in south Kolkata's Ballygunge on Saturday.
He was later declared dead at a hospital. The blood-soaked neck of a broken bottle was found from the spot.
"A SIT has been formed to investigate the case. A team of forensic experts and doctors today (Monday) visited the crime site and collected samples. We have also interrogated all those who were present at the party," said Joint Commissioner of Police Vishal Garg.
While police have registered a murder case based on a complaint by the Dasgupta family, the cause of the death is yet to be ascertained.
"Once we get the post mortem reports, we can come to a conclusion," said Mr Garg about the cause of the death.
The investigators have also have found evidence suggesting Abesh to have consumed alcohol on the day of the incident.
Rejecting suggestions that her son died of wounds caused after falling accidently on the broken bottle, Abesh's mother Rimjhim Dasgupta iterated he was murdered.
"It was not an accident. He was murdered and those present in the party know what actually happened that day. I think there are attempts to cover up the issue by giving it an accident angle," said Ms Rimjhim who on the day visited the city police headquarters.
While the Dasgupta family claimed that their boy went to attend the birthday party of Mr Chaudhuri's daughter Aruna, the Sahitya Akademi Award winning author has claimed that his daughter as well as most of the group present in the party, "did not know" Abesh.