Based on a habeas corpus plea by the father of the 15-year-old girl, a resident of Jameen Uthukuli near Pollachi in the district, the Madras High Court some months ago had ordered the police to expedite the case and solve the mystery.
A special police team stumbled upon the cell phone of the tenth standard girl and checked the last call she made before she went missing in April 2007, police said.
Thangaraj told police that he and the girl were in love and he had called the girl to his place after she came to know that his parents had fixed his marriage with some other woman, police said.
Further interrogation revealed that Thangaraj, with the help of his friend Rajkumar, had strangulated the girl and buried her body at Pattanam on the outskrits.