KTLA 5 News

There are more than 4,000 cold cases across Los Angeles County. Detectives in the Sheriff’s Department Unsolved Unit face the daunting task of trying to close them. To do that, they rely on a range of investigative tools, but DNA remains the ultimate key to identifying a murderer. Now, a new method of analyzing DNA is showing promise, though it is rarely used. It is called genetic genealogy, a tool far more complex than many people realize. KTLA’s @lindseypenanews reports.