The accused, Satish Kodkar, allegedly hit the victim Harshavardhan Rao twice on his neck and chest after which he fell on the classroom bench and hit his head on the edge of the bench, a senior police officer said.
Kodkar, who is a final-year student, is absconding since the incident, they said.
"Kodkar hit twice on Rao's neck and chest, after which he fell down even as his head hit an iron rod on the edge of a bench," Assistant Commissioner of Police (Sultan Bazar Division) Ravula Giridhar said.
A murder case has been registered with Sultan Bazar Police Station against Satish. Police is on the hunt to nab the accused, he said adding that the matter is under investigation.
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Kodkar had allegedly teased a girl who was Rao's friend, and objected to the act.
"A scuffle broke out during lunch hour yesterday, when Kodkar went inside Rao's classroom and argued with him over the matter before hitting him," the ACP said.