The girl's charred and disfigured body was discovered floating on the Dihing River.
The police have since arrested two men - Biswajit Chettri and Moinul Ali - and charged them under Section 366, 376 and 342/34 of the IPC.
Champa Chettri was reported missing by her family on April 29 when she did not return from her workplace, a local beauty parlor.
Her body was found floating in Dihing river by some local youths on May 3.
After attempt to burn the body of the victim failed, the perpetrators are suspected to have dumped her body into the river.
|People block a road with a burning tyre during a protest over the gang rape (Photo: PTI)|
“It is sad that the 2012 Nirbhaya case has been repeated in Assam... I don't think you've learned anything about laws for women's safety despite all your foreign trips in the last two years," he wrote.
The Gorkha students also called a bandh in Tinsukia on Monday demanding strict action against the accused.
The Assam police which is tight-lipped about its findings claimed that they are probing the incident and waiting for forensic report.