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Were axes and similar types of diss and many victims were dismembered. takes a special kind of predator to dismember a body. that's another form of linkage. if you look at the dismembering, the marks, what we call tool marks in the bone, you might be able to tell that the same tool was used to dismember different bodies. it's another way of linking these cases so yeah there's a lot going here to solve these cases if you can establish the linkage. >> it will have to go through the car and the residence as well, right? >> the car, the residence. it's all -- these are all technically crime scenes...

Kinds of things that you could use to make pipe bombs. the circumstantial evidence would indicate that he intended to kill himself to avoid having to talk to the police. >> next to white's body was his german shepherd dog. it matched the description of the dog given by the witness near the first bomb site. >> he was obviously clutching the bomb close to his body, and he had his one friend in the world there with him, his other arm around his dog. >> also in the garage, investigators found blue silver-coated wire, the kind used in the two church bombings. they also found a pair of wire cutters....

Marks from white's wire cutters to the tool marks on the copper wire found at the danville bomb site. >> from that comparison, i was able to conclude that these wire cutters, they recovered in rick white's garage was the same cutter found in the danville device. >> this was forensic proof that white was the bomber. >> we found an area of the garage that had red spray paint on it and contained on that red spray paint were perfectly round circles. the reason that was important was the device that killed mr. plower, which was a pipe bomb with end caps on it, those end caps were painted red with a...

Working on my own at that time. >> but leskowski remembered using a dental casting material called mikrosil in a case where he needed to see tool marks in a piece of metal. so, he decided to try some of that by putting it down the barrel of the gun. >> it consists of two parts, a silicone rubber base and then a catalyst or hardener. and basically it comes in two tubes. so, when one squeezes a certain amount of rubber material out and then a corresponding amount of hardener out, you mix the two together, and in this particular case, we injected the caste into the barrel and let it harden. >> it...

>> a tool mark is a characteristic left behind during the process of using a tool to either cut, grind, file or polish a piece of metal. >> there can be hundreds of microscopic tool marks in a pipe used in a homemade gun. when ballistics experts compared the bullets from the victims to those fired from seda's zip gun, the tool marks were microscopically similar. finally police asked seda for a blood sample for dan testing. dna matched that of the letter from the zodiac killer. detectives had the pleasure of telling seda they knew his true identity. >> i put out my hands and said i've been look...