Theodore Eastwick - a wealthy man well known as the principle architect of the City's buildings, a husband of Madeleine, who grew to resent him as he grew more and more obsessed with his work and she became an afterthought to him. Eastwick was paranoid, designing his house with many secret passageways and hidden mechanisms. The only way into the room where he lies is to enter through the secret elavator in the tunnels throughout his house.
Garrett finds his way into Eastwick's library only to discover that he committed suicide. Presumably he lost faith in northcrest and killed himself to avoid whatever punishment he had in store for him.