Sasikumar (86) was suffering from age-related illness. He was admitted to a private hospital this afternoon where he died in the evening, they said.
He directed as many as 141 films, a record of sort in Malayalam film industry. Nazir was in lead in about 80 movies in the greatest of all director-actor combine of Malayalam.
Though initially he was influenced by the neo-realistic trends of Malayalam films, Sasikumar switched over to entertainment thrillers and almost of all them became big success at the box office.
"Sasikumar is a director who made outstanding contributions to Malayalam cinema as a popular entertainment. As hit-maker he was unbeatable in 1960s and 70s by giving a new verve and vigour to suspense thrillers," said film historian Balagopal.
Sasikumar was a recipient of Kerala Government's highest film award instituted in memory of Malayalam film's pioneer J C Daniel.