[Verse 1] For forty years the Golden State remained unsolved Cold cases sitting dormant, mysteries unresolved But science had been changing, DNA could speak Genealogy and algorithms, finding who we seek [Chorus] Genetic genealogy, the family tree unfolds Public databases tell the stories that DNA holds Upload and compare, let the algorithms run Cross-reference relatives till the guilty one is done SNPs and markers, building bridges to the past Finally justice found him, science solved it at last [Verse 2] They took the killer's profile from the evidence preserved Built genetic markers that for decades had been curved Into family databases, twenty million strong they searched Finding distant cousins where his family tree had perched [Chorus] Genetic genealogy, the family tree unfolds Public databases tell the stories that DNA holds Upload and compare, let the algorithms run Cross-reference relatives till the guilty one is done SNPs and markers, building bridges to the past Finally justice found him, science solved it at last [Bridge] Third and fourth cousins, sharing common DNA The algorithm narrows down, eliminating every day Build a family tree backwards, find the common ancestor Then trace forward through the branches, computational factor [Verse 3] GEDmatch held the key with open-source genetic code Machine learning helped them walk the genealogic road From millions down to hundreds, then to dozens, then to few Till Joseph James DeAngelo emerged into their view [Chorus] Genetic genealogy, the family tree unfolds Public databases tell the stories that DNA holds Upload and compare, let the algorithms run Cross-reference relatives till the guilty one is done SNPs and markers, building bridges to the past Finally justice found him, science solved it at last [Outro] Now forensic genealogy lights the cold case way When DNA meets family trees, the guilty cannot stay Hidden in the shadows of the crimes they thought were done Science and technology, justice for everyone
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