Ranjitkumar suffered head injuries when he was allegedly attacked with a wooden club on October 12 at Kovaipudur over previous enmity.
After treatment at a private hospital, he was shifted to the government hospital two days ago, police said.
The other student was arrested a day after the incident and booked for attempt to murder. He was released on bail.
However, with the death of Ranjithkumar, the case had been converted into murder and a search was on for the accused, they said.
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