Anastasia Nicolazzi

And at some point, police figured out that they could use those same databases to help solve cases, too. So in this case, while it wouldn't necessarily return the name of Leslie's killer, it might give you a brother or an uncle, and police could then take it from there.

And at some point, police figured out that they could use those same databases to help solve cases, too. So in this case, while it wouldn't necessarily return the name of Leslie's killer, it might give you a brother or an uncle, and police could then take it from there.

And it didn't take long before GEDmatch returned the name of a possible second or third cousin of the person who left his DNA under Leslie Perlov's fingernails. Police were then able to trace that family tree right back to Northern California.

And it didn't take long before GEDmatch returned the name of a possible second or third cousin of the person who left his DNA under Leslie Perlov's fingernails. Police were then able to trace that family tree right back to Northern California.

The details of the report read like a death foretold.

The details of the report read like a death foretold.

There, John Getrue met a classmate named Margaret Williams. One evening, they went to a school function and Getrue offered to walk Margaret home.

There, John Getrue met a classmate named Margaret Williams. One evening, they went to a school function and Getrue offered to walk Margaret home.

But as a juvenile offender, Getru was released when he turned 18. Shortly afterwards, he moved back to California.

But as a juvenile offender, Getru was released when he turned 18. Shortly afterwards, he moved back to California.

They also figured out where to find him.

They also figured out where to find him.

And so a plan was formed to secretively obtain Getrie's DNA.

And so a plan was formed to secretively obtain Getrie's DNA.

investigators strongly suspected that they had their man, but they now hope that they had the actual evidence to prove it.

investigators strongly suspected that they had their man, but they now hope that they had the actual evidence to prove it.

In the interview room at the Santa Clara County Sheriff's Office, Noe sat down with the person he believed had strangled and killed Leslie Perlov, a man that had been walking free for over 40 years.

In the interview room at the Santa Clara County Sheriff's Office, Noe sat down with the person he believed had strangled and killed Leslie Perlov, a man that had been walking free for over 40 years.

Using forensic genealogy, police in Palo Alto, California had positively ID'd DNA recovered from the 1973 murder of Leslie Perloff.

Using forensic genealogy, police in Palo Alto, California had positively ID'd DNA recovered from the 1973 murder of Leslie Perloff.