On Sunday, Singh attended a programme in Thrissur organized by ex-service men in connection with Kargil Vijay Diwas.
After the event, Singh and other luminaries were invited to the house of Bijeesh, one of the organisers for lunch. This landed Singh in a new controversy as Bijeesh is a suspect in the murder attempt case of two CPM local leaders in 2011.
CPM has come up with allegations because Singh visited the accused while the investigation on the case is going on.
While the sources connected to Kerala Police said that the officials were not aware of the background of Bijeesh.
Rishiraj has a long history of being audacious and controversial. He hit headlines recently with an allegation that he didn't salute Kerala home minister during the passing out parade of state women police in Thrissur on July 11.