Stalin's visit comes a week after his father M Karunanidhi, ex chief minister, Tamil Nadu visited Kanimozhi at the Tihar jail in Delhi.
Stalin had met Kanimozhi earlier on May 24 at the special CBI court.
"Due to the harsh Delhi heat, she has developed boils all over the body," said Karunanidhi after his visit at Tihar adding that Sharad Kumar was also in poor health.
Karunanidhi's favourite child Kanimozhi, was rejected bail on Jun 20 by Supreme Court.
Kanimozhi along with Kalaignar TV MD Sharad Kumar is accused of receiving a bribe of whopping Rs 200 crore in connection with the 2G spectrum scam.
It was the third consecutive bail rejection for the duo as Delhi High Court and a trial court had earlier dismissed their bail pleas. Sources also claim that Kanimozhi may have to spend another year in jail.
Though CBI could not submit the original documents which show money transferring in and out from Kalaignar TV, the investigation agency opposed the bail plea saying, Kanimozhi and Sharad Kumar may destroy the evidences against them if they are allowed to walk free.