Tyrus Fallit was a large man in service to crime lord Fagin, acting as a subordinate to Fagin's assistant Markus Ralian (who loved being able to lord it over the much bigger Fallit).
Fallit was a cold-blooded killer; the only thing that made him emotional was mentioning the murder of his sister.
Fagin ordered Markus Ralian to keep a captured psychic Old Family member, Nova, at Ralian's house. Tyrus Fallit was assigned to watch over Nova, but her mind-reading creeped him out.
When Fagin captured Nova for the second time, he ordered Fallit to kill a child. Nova was too slow; she blew up his T20 pistol but was unable to save the girl.
This, along with Fagin's psi-screen, forced Nova's surrender.
DeCandido, Keith R. A. StarCraft: Ghost: Nova. New York: Pocket Star Books/Simon and Schuster, November 2006. ISBN 0-7434-7134-2.