Using forensic DNA analysis, the notorious serial killer has been unmasked:
Jari used the same extraction method on the semen traces on the shawl, warning that the likelihood of sperm lasting all that time was very slim. He enlisted the help of Dr David Miller, a world expert on the subject, and in 2012 they made another incredible breakthrough when they found surviving cells. They were from the epithelium, a type of tissue which coats organs. In this case, it was likely to have come from the urethra during ejaculation.
Kosminski was 23 when the murders took place, and living with his two brothers and a sister in Greenfield Street, just 200 yards from where the third victim, Elizabeth Stride, was killed. As a key suspect, his life story has long been known, but I also researched his family. Eventually, we tracked down a young woman whose identity I am protecting â a British descendant of Kosminskiâs sister, Matilda, who would share his mitochondrial DNA. She provided me with swabs from the inside of her mouth.
Amplifying and sequencing the DNA from the cells found on the shawl took months of painstaking, innovative work. By that point, my excitement had reached fever-pitch. And when the email finally arrived telling me Jari had found a perfect match, I was overwhelmed. Seven years after I bought the shawl, we had nailed Aaron Kosminski.
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