A senior police officer said as per preliminary probe, the minor was allegedly hit with broken liquor bottle pieces by a youth during an altercation after a girl's birthday bash at a city club.
The altercation broke out as the girl and her friends reached her apartment in upscale Sunny Park under Ballygunje police station area and there was a scuffle.
As the teenager slumped to the ground in a pool of blood in the basement, the alleged assasin sped away along with the other friends of the birthday party including the girl, the officer said.
He was declared brought dead and the hospital diagnosed the cause of death as profused bleeding and resultant multi-organ failure, the officer said.
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One person has been detained in connection with the incident, the officer said adding the other friends, including the suspected assailant, were still at large.
Personnel of homicide squad collected samples including broken glass shards from the sprawling lawn and sniffer dog was also pressed into service.
Both youths came to the girl's birthday bash along with a host of other friends numbering around 15 at Princeton and the arguments began once the party was over and they reached the girl's home, he said.
The deceased, whose father had died earlier, was also a resident of nearby Southern Avenue.
The boy's mother's statement was now being recorded by police.