"Target acquired. Proceeding to phase two of assassination protocols."
―An MRD-39B droid[src]

The MRD-39B assassin droid was a model of assassin droid that was developed by the Corporate Sector Authority. They were black in color and had six legs, each of which contained a different weapon. However, while the droids were originally intended to be disposable, their design became complicated and they cost AurebeshSans-Serif credit20,270 each to manufacture, and due to their price, the CSA considered them to be less expendable than organic operatives. During the waning years of the Galactic Republic, an MRD-39B droid was dispatched to assassinate the Republic agent Klieri, inside her apartment in the city Locus on the planet Nyriaan.