 Development of Thief III was delegated to the Warren Spector @-@ supervised Ion Storm Austin , which had recently completed Deus Ex . According to Spector , Thief III would have been given to Core Design or Crystal Dynamics had he not accepted it . The game was announced for Windows and the PlayStation 2 . On August 10 , Spector commented that Ion Storm 's first goal was to assemble a core team , composed in part of former Looking Glass employees , to design and plot the game . Thief II team members Randy Smith , Lulu Lamer , Emil Pagliarulo and Terri Brosius were hired to begin the project . On August 16 , Ion Storm announced its hires , and stated that concept work on Thief III would begin in September . The team planned to " wrap up [ the ] loose ends " of the series , and they built directly upon the Thief III concept work done at Looking Glass . Thief III was eventually renamed Thief : Deadly Shadows , and it was released for Windows and the Xbox on May 25 , 2004 . 
