Dhinakaran reached the Crime Branch Inter State Cell office in Chanakyapuri around 2 PM. There was heavy security outside the residential compound that houses the office of the Inter State Cell.
Yesterday, he was questioned for close to seven hours in the case.
An ACP rank investigating officer had quizzed Dhinakaran, the nephew of jailed AIADMK chief Sasikala.
A senior police official had said that Dhinakaran was given a questionnaire concerning the money trail, his association with Sukesh Chandrasekar (the middleman who was arrested) and whether he had met any Election Commission official.