They had murdered Suresh over previous enmity, sources said.
Police said they would file a petition seeking their custody on Monday.
N Suresh Babu alias 'Pottu' Suresh was hacked to death on the night of January 31.
Madurai: Seven persons, allegedly involved in the murder of 'Pottu' Suresh, a DMK functionary and associate of Union Minister MK Alagiri on Saturday surrendered before the Judicial Magistrate Court in Dindigul district, police said.
First Published: Saturday, February 02, 2013, 12:42