However within a few months Benoy and his group was brought into action again. The inspector General of prisons, Col NS Simpson had become an eyesore of the revolutionaries for unleashing a brutal oppression on the prisnors in the jail.The revolutionaries decided not only to liquidate him, but also to strike a terror in the British official circles by launching an attack on the secretariatBuilding. On 8 Dec. 1930, Benoy along with Dinesh Chandra Gupta and Badal Gupta, dressed in European costume, entered the writers' building and shot dead Simpson.Some other officers like Twynam, Prentice and nelson, known for their terror tactics, also suffered injuries during the shooting.
Despite being successful in their venture Benoyand his fellow revolutionaries, however, could not escape. The police contingent under the command of the inspector general and the police commissioner opened fire on them.The young revolutionaries continued the unequal fight for some time. Determined not to give themselves upto the police Badalswallowed Potassium cyanide, while Benoy and Dinesh shot themselves with their own revolvers.Badal died instantly,. Benoy succomed to his injuries on 13 Dec. 1930, Dinesh recovered in the hospital, was tried and sentenced to death. Thus Benoy and his fellow revolutionaries b ecame martyrsand their sense of dedication and self sacrifice became objects of emulationfor the future generations in Bengal.