"His demise is a huge loss to the country. I extend my deep condolences to his family members and friends in the journalism world," he said in a statement here.
While his novelist brother R K Narayan was recognised by the English world for his works, Laxman worked for more than 60 years as a cartoonist for an English daily, Karunanidhi noted.
Laxman passed away on January 26 in Pune.