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Deja Vu II: Lost in Las Vegas was the direct sequel to Deja Vu and one of the four "Macventure" games released for the Macintosh. Like Deja Vu (Along with Shadowgate and Uninvited) Deja Vu II was to be ported to the NES by Kemco, but it never got released for unknown reasons. Deja Vu II would later see a port to the Game boy color (The Game boy color port was called "Deja Vu I & II - The Casebooks of Ace Harding") and the CDI.
As of today no prototypes have been found and no ROMs exist, The only thing of the NES port that currently exists are a few screenshots.
Screenshots
References
References
http://www.unseen64.net/2008/04/11/ace-harding-nes-unreleased/