At the end of the fourth round of counting of votes polled in the June 12 bypoll, AIADMK's Karthik Thondaiman has secured 17,871 votes against Jahir Husssain's 6,249, a lead of 11,622 votes, officials said.
The bypoll witnessed a virtual straight contest between AIADMK and Vijaykant-led DMDK. DMK and Vaiko's MDMK did not contest the byelection.
The bypoll was necessitated by the death of CPI MLA SP Muthukumaran in a road accident on April 1.
