Though police had arrested Das' friend Santosh Kumar Gupta from Bengaluru in connection with the crime, they are yet to trace the person who stabbed the 23-year-old near Kanbay Chowk on the outskirts of the city on December 23.
Das was working with Capgemini.
As the police couldn't file the chargesheet against Gupta within the stipulated period of 90 days in the absence of any conclusive evidence, a local court granted him bail in March this year.
"We are probing the case from multiple angles. Even though Gupta was arrested, we did not get much details from him, so we are now investigating other angles too," said a crime branch official.
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He said the police have announced the reward in order to get some clues in the case.
"The reward is for any person who can share the information regarding the crime," he said.
Meanwhile, Gupta's lawyer Anup Pande said the declaration of the reward shows that his client is innocent.
As per the bail condition, Gupta, who hails from Bihar, was asked to visit the local police station every week.