FIRST AIRED: April 27, 2018

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00:00:00
>> Police finally got their break in the Golden State Killer case by combing through commercial genealogy websites. Investigators compared DNA found at the crime scenes to genetic information listed on the websites, which led them to family trees of close matches. The process produced a promising lead a week ago.
00:00:19
The DNA of a relative of former police officer, Joseph DeAngelo.>> What would of had to have happened is that they would have had to supply those companies with a DNA sample from one of the rape victims.>> When the 72-year-old was identified last week as a possible suspect, investigators monitored his home and collected samples of what they called discarded DNA.
00:00:42
They made a positive identification leading to his arrest. DeAngelo was suspected in a dozen murders as well as 45 rapes and more than 120 burglaries that terrorized California communities in the 1970s and 80s. The decades long crime spree was considered one of the most prolific in the state.
00:01:01
DeAngelo was due to make his first court appearance on Friday.