He said he will pronounce the quantum of sentence on February 6.
According to prosecution, B M Ummer alias Ummer Bari (33) was in love with Fathima Suhara but she spurned his advances.
On the night of December 28, 2006, he climbed a coconut tree near the victim's house at Uluvar village near Manjeswaram, removed the roof tiles and got inside the room where she was alone and murdered her by slitting her throat.
During the course of the trial, 22 witnesses were examined.
Ummer, who was arrested, subsequently came out on bail and went absconding but was traced to Nasik near Mumbai and arrested again in 2014.