Rambhai Bhilariya (27), the victim, worked at HDFC bank's Keshod branch, police said.
Bhilariya and his colleague Kishor had struck a deal with the accused Bhikhubhai to exchange latter's defunct currency notes for commission, said inspector A V Tilva.
"Bhilariya and Kishor had told some persons that they can exchange defunct notes with new notes on 20 per cent commission," said the police officer.
Bhikhubhai asked Bhilariya and Kishor to come to Magarwada village near the town in the afternoon with Rs nine lakh in new currency.
"Bhilariya died while Kishor is admitted to a hospital. We have lodged a case of murder with robbery," inspector Tilva said, adding that search was on for the accused.