Ilavarasan's body was found along a railway track in Dharmapuri on July 4.
The commission will be headed by retired Madras High Court judge Justice S.R. Singaravelu.
The post-mortem report of Ilavarasan's body claimed that he died due to a head injury.
His family has alleged that he was murdered.
The police, however, said the man committed suicide.
Amid controversy over Ilavarasan's death, the Madras High Court on Friday directed the authorities to preserve his body.
The court reportedly said that the video of the autopsy will be shown to Ilavarasan's family. In case, they are not satisfied with it then another autopsy will be performed on the deceased Dalit man's body.
Ilavarasan had married an upper caste Hindu girl Divya Nagaraj last year.
The marriage had triggered anti-Dalit violence in three villages of Dharmapuri in November last after the woman's father committed suicide.
Around 200 huts reportedly owned by Dalits in and around the village where Ilavarasan lived were torched following the death of Divya's father.
Divya later returned to her family and started staying with her mother.
Divya's mother had filed a case in the Madras High Court asking her to be released from "unlawful detention", reports said.
Divya on July 3 told the Madras High Court that she will never go back to her husband.
The court on July 5 directed authorities to give security to Divya and her family.
--IBNS (Posted on 08-07-2013)