. >> here at a walgreens drugstore in meridian, idaho, just before 10:00 p.m.n a friday night in march 2011, time was up, devil wanted his due. robert hall was a man on a mission. as you can see on the store surveillance video, rob parked his pickup truck, went through the front door, roamed the beauty and cosmetic aisles. he was looking for his wife, kandi, who, of course, was in a pickup truck with her lover, emmett. here, you can see rob leaving the store, looking at kandi's parked bmw. then, strangely, getting back into his own pickup truck, pulling out and remarking it on the other side of kandi's car. curiously, his door now just out of range of the store surveillance camera. this is when he made that phone call. the one in which kandi confessed she had been with her boss, emmett corrigan. and he said to rob, what's up, chief? and here was emmett's truck speeding through the parking lot, still time to stop this, if wiser heads had been in charge. but they weren't. nothing wise about what's coming. >> i see rob in his truck, and he has just this look on hi