Kaston Iago

 was an assassin. He was also a fugitive from the interplanetary Federation.

In 2889, he committed a series of random murders in Kaldor City so that Kiy Uvanov would hire him as a bodyguard. (AUDIO: Occam’s Razor)

Behind the Scenes

 * It was hinted but never confirmed that Iago was a pseudonym of the Blake's 7 character Kerr Avon.