it was after fischel left the company that the money came rolling.ghts his contribution to the invention deserve more than what he got, so he sued his former friend and partner, bill mclaughlin. and here's the thing. it was just two weeks before the murder that the courts decided for bill, any day he was to get a 9 million he and fischel had been fighting over four years. so, was a revenge killing? sounded at least plausible. except for something that killer left behind. something fischel didn't have access to. no, it was in dna, not fingerprints. something more mundane than that. >> when we got here, the door on the right was open, and there was a key stuck in the locker right here. in addition to that, there was a key on a matte laying right next to the door here. >> two keys. too close. one was a brand-new copy of the front dorky. the other was a key to the community pedestrian get. not a copy. >> those are huge, because it eliminates everybody in the world from being a suspect down to only those people that have access to those two keys. >> the c