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The remington rifle ejects a shell casing between shots. at least one of those would have flown out, as the killer racked another round in the chamber to shoot shirley twice. >> it was never found. >> so somebody had the presence of mind to gather it up? >> that's correct. >> reporter: and since webb promised to look at every possibility, he examined bill's movements the day of the killing. phone records show shirley making a call from the house phone at 8:45 a.m., after bill had dropped her off. and by 9:00 a.m., bill was spotted did he grainery, 50 miles from the house. webb said bill's only...

The door's open. it looks like a gun shot hole in the window, and there's a shell casing inside and the bedroom door's closed. >> who are you doing the welfare check on? >> jim knapp. >> reporter: jim knapp was dead. gunshot wound. the medical examiner ruled it a suicide. >> i was stunned. it was -- it was one of those moments where it just sort of took my breath away. and then when i found out there was no note and as i learned about the details of what the scene looked like, it's still a baffling death. >> reporter: baffling because it simply did not look like a suicide. >> there was multipl...

Bringing in expert examiners from dallas, san antonio, el paso, from the neighboring field offices to assist the investigators there to process what they're calling multiple crime scenes. as you mentioned, this was a span along a highway and popular theater area. and so when you have someone firing indiscriminately along that way, every shell casing has to be accounted for and all that collected. this is going to be a massive effort. that's what we're going to see, authorities going through and doing a concerted effort to gather all the evidence. bhoopd the scenes there will also be an effort ...

Up and down the field looking for something. they were. they were. imagine what they found along the ditch in the highway. >> probably the most important thing they found a loaded magazine, the same type found in the crime scene. the shell casing at the crime scene found the ammunition found in the ditch on highway 141. >> right in the ditch where the car crashed. >> on the highway, a little further down, but within 500 yards of where the crash was occurred. they also located in that ditch some paper targets that you would use for shooting target practice. some shooter's ear muffs, a camo neck...

Yet they found an empty gun case in chris and bianca's apartment, but nothing to connect the case to the murder. and just about then -- >> the sergeant for the district attorney's office just happened to call me and ask, hey, did you ever look in that gun case? was there shell casing or anything in that gun case? >> reporter: turns out the gun's manufacturer includes a test-fired shell casing with each gun it sells. so the detective went to the evidence locker, he said, retrieved the gun case. >> looked inside and there was a casing. >> reporter: big moment. >> big moment. >> reporter: big mom...