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The previous episode showed how homicide detectives solved 50-year-old cold cases.
They analyzed old evidence using new DNA extraction technology pioneered by Othram, a forensic genealogy lab in Texas.
Othram provided new leads by finding relatives of suspects on genealogy databases.
As revolutionary as that seems, it was just a few years ago that the FBI pioneered the use of mitochondrial DNA in a Texas murder case.
Mitochondrial DNA is handed down from mother to child, so it can only tell you about your maternal ancestors.
In a landmark case, former U.S. prosecutor Bill Johnston used the mitochondrial DNA from a single hair to send a killer to prison for the rest of his life.
Hereās the backstory of how he did it.
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