On Monday, Toronto police announced that they had arrested the 61-year-old in connection with the murders of two Toronto women in 1983, Erin Gilmour and Susan Tice.
“Our DNA testing is something that no one else on earth can do right now the way that we do it here at Othram. We are the first lab that's purpose-built to take this type of evidence and use it for this really advanced forensic genome sequencing process,” Mittleman said. “I believe that this [DNA sample] was a sperm fraction,” Mittleman said, noting that their team discovered a “mixture” of DNA samples from the “perpetrator and victim” in this particular cold case.In the “exact same manner” Mittleman said they worked with the Toronto police to uncover the man responsible for theinfamous Golden State Killer
She said the key difference between the Sutherland and the Golden State Killer case was that the latter had “multiple victims and a ton of DNA,” whereas the Toronto cold case had a “very small” and “intractable” sample.
So the key was - ID a family group (I assume part of DNA matched a family member who was in database) - Then drill down family members of that group whose DNA matches more and more fragments from sample from victim