Zarien Kheev, a Zabrak, was an Imperial slave master, whose defining attribute was his sadistic personality. He once owned the mercenary Twi'lek Rianna Saren as his personal slave. After she unsuccessfully tried to escape from him, Kheev – in one of his sadistic moments – cut off one of her head-tails. She later tried to escape again, and this time, succeeded.
Some time later, after Rianna was hired by the Rebel Alliance in a mission involving the Death Star plans, she found herself face to face with Kheev again – but this time, she killed the ruthless Zabrak.