Ramakrishnan, Mani's younger brother, said they met the Chief Minister to press for a CBI investigation into the actor's death as they were not satisfied with the probe being carried out by the state police.
The 45-year-old actor, who had essayed various roles in south Indian films, had died under suspicious circumstances on March 6 this year at his farmhouse in Thrissur.
While a lab at Kochi had found traces of chlorpyrifos, a toxic pesticide, in his viscera sample, a Hyderabad lab had recently stated that traces of methyl alcohol were found in his blood.