The results are more suggestive than conclusive and the original results were vastly oversold (as is always the case with any new Ripper theory) but after 130 years, it is doubtful that any smoking gun is going to emerge. This might be as close as we will get.
Fractional mtDNA matches are not matches at all, since billions of us have a lot of mtDNA in common (16000 base pairs, something like that).
No, We Still Cannot Confirm the Identity of Jack the Ripper
By Jason Daley
smithsonianmag.com
March 18, 2019
https://www.smithsonianmag.com/smart-news/jack-rippers-dna-collected-shawl-though-doubts-linger-180971726/
The error in the DNA analysis, performed by Jari Louhelainen, may involve something as simple as getting the numbers wrong. “This DNA alteration is known as global private mutation (314.1C) and it is not very common in worldwide population,” Louhelainen wrote. ” … Thus, this result indicates the shawl contains human DNA identical to Karen Miller’s for this mitochondrial DNA segment.”
The problem, Jeffreys said, had to do with writing the mutation as “314.1C.” In the calculations, it really should have been written as “315.1c.” “Had Dr. Louhelainen done this, and followed standard forensic practice, he would have discovered the mutation was not rare at all but shared by more than 99 percent of the people of European descent,” the Independent reported.
earlier:
https://www.casebook.org/dissertations/dst-edwards.html