Hi my name is Jason and I play a Sith Marauder who in his journey has killed every enemy who has crossed his path. Please explain why I don't have the option to kill Malavai Quinn when he betrays me. Sorry for spoiling it for players who have not yet played the class but in the next expansion of the game please implement the option to finally have revenge. Thanks. -Armandi Sol
The option was there in beta.
And many players killed him off. Afterwards the majority of players that killed him off, submitted complaints to bring him back because they missed having a healing companion.
So, BW removed the ability to kill off companions.