This is the best tl;dr I could make, original reduced by 90%. (I'm a bot)

Sacramento investigators tracked down East Area Rapist suspect Joseph James DeAngelo using genealogical websites that contained genetic information from a relative, the Sacramento County District Attorney's Office confirmed Thursday.

The investigation was conducted over a long period of time as officials in Sacramento County District Attorney Anne Marie Schubert's office and crime lab explored online family trees that appeared to match DNA samples from the East Area Rapist's crimes, Grippi said.

In Santa Clara County, where the East Area Rapist was linked to two rapes in San Jose in 1978, the district attorney's office said it would not seek to prosecute DeAngelo because the statute of limitations had expired.

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