Kathryn Mayorga had accused the Portuguese football star of rape in 2009.
This was the first visit by the CBI sleuths to Walayar after taking over the sensational case.
The woman who was raped is also a migrant worker. She was called to Ansari's home on the pretext of preparing biryani.
A video showing the girl and the accused tied with ropes, being beaten and forced to walk in public in the village under Jobat police station amidst slogans of "Bharat Mata Ki Jai" has gone viral on social media.
She reached the home of the accused on February 6 after she was told of a job interview there.
Parimal Sahu (26), alias Munna, was awarded the death penalty by judge Murali Gopal Pandalai under IPC Section 376A which enjoins punishment for sexual assault.
The assault came to light after the girl, staying with her mother, brother and grandparents, told about the abuse to one of her relatives 10 days ago.
The Court observed that the woman's complaint had deeply hurt the morale of health workers across the state. After the matter came to light, Kumar was also sacked from his job.
The woman heaved a sigh of relief as the court here sentenced the man who had sold her for flesh trade when she was eager to land a job.
Suresh, a native of Kadakkal in Kollam, was accused of raping the victim and forcing her into flesh trade after keeping her in illegal custody for several days.