A special team of police set up to trace the murderers and finally arrested Sethukumar. He was the former driver of leading South Indian actress Nayantara.
Cherthala police are inquiring the whereabouts of other associates of Sethukumar and the reason behind the murder.
Cherthala police have arrested Nayantara's former driver in connection to the murder of Congress leader Diwakaran (39) on Wednesday. Diwakaran was brutally murdered by some unknown persons, a few days ago at his Cherthala residence near Alleppy.