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Worked with bill on an early phase of the machine. it was after fischel left the company that the money came rolling in. fischel thought his contribution to the invention deserved more that he got so he sued bill mclaughlin, his former friend and partner. here's the thing. it was just two weeks before the murder that the courts decided for bill. any day he was to get the $9 million he and fischel had been fighting over for years. so was it a revenge killing? sounded at least plausible. except there was something the killer left behind, something fischel didn't have access to. no, it wasn't dna...

Helpful, and make lots of money, too. >> reporter: he enjoyed learning now things, discovering new things, especially if it helped people, benefitted people, if he could make money off of an idea. >> reporter: hal fischel had worked with bill on an early phase of the machine. it was after fischel left the company that the money came rolling in. fischel thought his contribution to the invention deserved more that he got so he sued bill mclaughlin, his former friend and partner. here's the thing. it was just two weeks before the murder that the courts decided for bill. any day he was to get the ...

Key on a mat laying right next to the door here. >> reporter: two keys. two clues. one was a brand new copy of the front door key. the other was a key to the community pedestrian gate, 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. >> reporter: the circle of suspects was getting smaller. coming up -- police focus on one particular suspect who did have access to those keys and to something else. >> he had bought a 9 millimeter in the summer, a beretta 92f. >> you lied to them. >> i d...

>> when we got here, the door on the right was open andre was a key stuck in the lock right here. in addition to that, there was a key on a mat laying right next to the door here. >> reporter: two keys. two clues. one was a brand new copy of the front door key. the other was a key to the community pedestrian gate, 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. >> reporter: the circle of suspects was getting smaller. coming up -- police focus on one particular suspect who did have ac...

In addition to that there was a key on a mat laying right next to the door here. >> two keys, two clues. one was a brand new copy of the front door key. the other was a key to the community pedestrian gate, not a copy. >> those are huge because it -- it eliminates everybody in the world from being a suspect down to only those people that have access to those two keys. >> the circle of suspects was getting smaller. >> coming up, police focus on one particular suspect who did have access to those keys and to something else. >> he bought a 9 mm in the summer, a berhe. >> you lied to them. >> i di...