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The metal fragments found on arlene jensen's body and in her apartment were sent to the forensics lab for testing. under a microscope, scientists could see that the fragments were different shapes and sizes. the surfaces were corrugated and the composition of the metal varied from piece to piece. >> they were made of various types of steel, various grades of steel, various grades of brass. >> the unique shapes and the fact some were hollow were a clear indication of their origin. >> what that means to me is it's a piece of metal projected through the air. when it's projected through the air, m...

Feet. i was screaming, i mean, blood-curdling screams. he ripped my slip off and he started running. >> after that assault, police found hundreds of pieces of women's underwear in his home. >> this is a dangerous guy. he's knocking women down, he's dragging them into bushes, he's stealing their clothes, he's breaking into their houses. this is someone who's pretty much out of control. >> gorton served some prison time for these assaults in florida before moving back to michigan. since both murder victims had been sexually assaulted and investigators had dna of the killer, they wanted to know w...

Florida before moving back to michigan. since both murder victims had been sexually assaulted and investigators had dna of the killer, they wanted to know whether it was gorton's dna. so they put gorton under a 24-hour surveillance. they followed him to a local roller skating rink where he took his children. undercover officers watched gorton eat pizza and drink soda from a styrofoam cup. when gorton left, an officer rushed to the table, confiscated gorton's cup and took it to the forensics lab. the sample was tested immediately. >> dna is like any other biological molecule, subject to degrada...

Lee's dna sample was sent immediately to the forensics lab for testing. it matched the biological samples from all five victims. >> just a sense of relief and joy come over me. and it's like i had to smile. i said, we got him. derrick todd lee was arrested and charged with first degree murder. >> the first thing i would tell him is he's a coward. he picked on women that he took advantage of their good nature. >> after his arrest, investigators learned that lee's dna matched skin cells under the fingernails of yet another murder victim, an lsu student, 21-year-old jerry lynn desoto. prosecutors...

In the search for shamia smith, investigators collected dozens of what appeared to be bone chips from the fire pit on ken otto's property and sent them to the forensics lab. >> this skeleton was burned so significantly that it was nearly destroyed as if it would have been in a commercial cremation. the fragmentation was so severe that you had pieces that were the size of a fingernail. it really is like a needle in a hay stack. it was an anthropologist's nightmare. >> after close examination, forensic anthropologists concluded that the majority of the bones were human, but that didn't mean the ...