Chis Tak was Chiss Sith commander. After losing the Battle of Ootoo III, Tak was informed that the surrender terms would be unconditional. This enraged Tak, and forced him to strike out at a Jedi, who in defense killed Tak.
Behind the scenes[]
The name Chis Tak comes from the words 'Chiss Talk', which comes from the Chiss with the speech impediment in Star Wars: Jedi Knight: Jedi Outcast.