DSP P Mathavan said the boy was in love with the 16-year-old girl and they had left their Malayalapatti village village two days ago. He was questioned by the girl's relatives when he returned alone and had taken them to a forest area where her body was found.
Angry relatives then tied him to a pole and beat him up till he collapsed and died.
Two murder cases were registered-- one against the girl's parents and brother and another against the boy for allegedly killing the girl.