detective chris everett: no fingerprints. no dna.ankiewicz: the only real clues were found on the fedex envelope--duct tape and soot-- suggesting the bomb might have fallen off the underside of a car... and so... two weeks later... when connie's truck blew up at the daycare home... investigators immediately wondered... were these two sophisticated bombs really the work of terrorists... or was all this personal? robert luke: we went through all those gamuts and we had a lot of people just going out and chasing every lead there was to try to get this stuff done. josh mankiewicz: and ... while he was still at the crime scene... detective luke had what seemed to be an odd visit... from an old colleague, eric stalnaker. the former commander of the san diego fire department bomb squad, ...that's luke to the left of your screen and stalnaker to the far right. robert luke: he was the first one to contact me as soon as i got on the scene, and i says, what are you doin' here? he tells me he had retired to colorado. came back to visit some frie