The accused Mathanraj, a fisherman by profession, surrendered before the police a few hours after the incident.
The victim was an engineering student from Chellanenthal village in Pudukottai district, police said and added that she was studying first year B.Tech in a college in Chennai.
According to police, the girl fell in love with Mathanraj, who stayed at Jagadapattinam in Pudukottai districtfor fishing.
After joining the engineering course, she had reportedly started avoiding him.
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She started from Chennai to her native place yesterday. Early this morning, he met the girl at Mayiladuthurai bus stand and persuaded her to go with him to Poompuhar.
During a chat at the Poompuhar beach when the girl reportedly told Mathanraj that she was not interested in him, he got furious and attacked her with a big stone.
She fell down in a pool of blood and died on the spot following which Mathanraj fled the scene.
Sirkazhi DSP Sekar, Poompuhar police inspector Singaravel and other officials rushed to the spot and sent the body to Sirkazhi GH for postmortem.
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