A K4 security droid was part of the droid contingent assigned to the New Republic CR90 corvette FarStar during its mission to track Moff Kentor Sarne through the Kathol sector. One of six K4 units stationed aboard, it was assigned to guard the bridge. In 8 ABY, the K4's programming was subverted by the Imperial spy known as the Wraith. Fitted with a miniature dart gun loaded with a poison-coated dart, the droid attempted to assassinate Captain Kaiya Adrimetrum during the Battle of Galtea.