"We will send the summons to everybody. Based upon the convenience of the officials and others involved in the matter, we will conduct an inquiry...," he told reporters here.
He said at least fifteen people would be inquired during the investigation process along with evidences.
"We hope to complete it faster", he said to a query on how long would it take to get the case completed. He said the next round of investigation would take place later this month.
Ilavarasan was found dead near a railway track in Dharmapuri on July 4, a day after his wife Divya had said she would never go back to him and would stay with her mother.
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Ilavarasan married Divya on October 14 last year after which her father committed suicide in November.
Divya's mother had opposed the inter-caste marriage. Her marriage and her father's suicide triggered violence in the three villages of Natham, Kondamapatty and Annanagar on November 7 last when about 296 huts belonging to Dalits were torched allegedly by the caste Hindus.