Apparently there was a Die Hard game planned for the N64 late in the console's life, which eventually went on to become Die Hard: Vendetta for the Gamecube. A Prototype has surfaced recently (unfortunately not publicly as far as I can tell) along with some gameplay footage:
Interesting. Considering how well loved the shooters of the N64 era are, I wonder if this one could have held a candle to the likes of GoldenEye and Doom64. The bullet-time gimmick would have been pretty ahead of the time on the 64 too.
I know somebody that has a copy of this, site he's on is down for server maintenance atm. I also know a lot of protos that haven't been seen by many too. I'll share them when it comes back up.