Research Officer and Head of Office Chandraprabha and investigator Lister from Chennai went to Shankar's house in Kumaralingam near Udumalpet and met his father to gather details about the incident.
They then met Kausalya, who is undergoing treatment at the government hospital here under police protection, along with senior medical officers.
Later Chandraprabha told reporters that they would submit their report to the Commission in Delhi in two days.
He sought protection to his family as he feared they could be attacked any time, Chandraprabha said.
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Kausalya said she wanted to study and try for a job and requested that somebody from her husband's family come and stay with her in hospital in her moment of agony, Chandraprabha said.
Shankar (22) and Kausalya (19) were attacked by a gang with sickles in full public view on Sunday in nearby Tirupur district, resulting in the death of the husband.
Kausalya's father, Chinnasamy has already surrendered before the police.