. >> david foley was county district attorney at the time. door to door canvas turned up a critical clue for the timeline. >> a neighbor couple had heard gunshots, three gunshots, friday evening. somewhere around 9 pm. >> on the property itself though, detectives found themselves frustratingly short of clues. but they did recover in the grass a soggy piece of paper that looks like a receipt. it would be work for the lab to figure out. and around the garage, investigators took note of something perplexing. three exterior lights, the bulbs were missing. >> why are the bulbs gone? this is odd. this is really odd. >> so, somebody had done some planning? >> rang to the doorbell, can't see who's out there, flips the lights on. nothing happens. opens the door. there is his assailant. >> so, the shooting of the superintendent for a grievance unknown became one theory to pursue. but detectives were about to hear a story that would make them look at the crime scene in a completely different way. something more traditional. was it possible that keith re