Genetic genealogy that caught notorious killers now used in Nancy Guthrie case

Investigators looking to way down Nancy Guthrie’s suspected kidnappers are turning to a comparatively caller exertion that has been attributed to solving immoderate of the astir prolific transgression and acold cases successful American history. 

Investigative familial genealogy (IGG) is defined arsenic "the subject of utilizing familial and genealogical methods to make leads for instrumentality enforcement entities investigating crimes and identifying quality remains," according to the International Society of Genetic Genealogy. 

Investigators usage a DNA illustration to hunt for familial familial matches, yet looking to constrictive down imaginable identities by zeroing successful connected adjacent relatives of the individual. 

On Tuesday, the FBI confirmed to Fox News Digital that IGG was being utilized to trial DNA recovered connected a achromatic mitt discovered 2 miles from Nancy Guthrie’s location and different DNA samples recovered wrong her house.

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Savannah Guthrie and her mother, Nancy Guthrie, are pictured unneurotic successful 2023. (Nathan Congleton/NBC via Getty Images)

The determination comes aft some samples did not find a lucifer successful the nationwide instrumentality enforcement database, CODIS – which lone includes individuals antecedently known to authorities.  

The exertion has been utilized to lick respective high-profile cases successful caller years, with the FBI present turning to IGG successful hopes of identifying the DNA recovered connected the mitt discovered 2 miles from Nancy Guthrie’s location and different samples located wrong the house. 

Here is simply a look astatine erstwhile cases successful which IGG helped authorities find their suspect.

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This representation released by the FBI amusement an equipped idiosyncratic appearing to person tampered with the camera astatine Nancy Guthrie's beforehand doorway the greeting of her disappearance successful Tucson, Arizona, Sunday, February 1, 2026. (Provided by FBI)

The Idaho Murders

Immediately pursuing the brutal murders of 4 University of Idaho assemblage students connected Nov. 13, 2022, investigators raced to way down the idiosyncratic liable for sidesplitting Madison Mogen, Ethan Chapin, Xana Kernodle and Kaylee Goncalves.

Using DNA recovered connected a Ka-Bar weapon sheath near down astatine the transgression scene, authorities sent samples to forensics laboratory Othram aft coming backmost empty-handed erstwhile utilizing CODIS.

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Bryan Kohberger appears astatine the Ada County Courthouse for his sentencing hearing, Wednesday, July 23, 2025, successful Boise, Idaho, for brutally stabbing 4 University of Idaho students to death.  (AP Photo/Kyle Green, Pool)

Othram was past capable to make a DNA illustration that matched items pulled from Bryan Kohberger’s household trash astatine their Pennsylvania home, starring investigators to "a antheral arsenic not being excluded arsenic the biologic begetter of Suspect Profile," according to the affidavit. 

Kohberger was subsequently taken into custody connected Dec. 30, 2022 and pleaded blameworthy to the quadruple murders past summertime arsenic portion of a plea woody to flight the imaginable decease penalty. 

He is serving 4 consecutive beingness sentences, positive different 10 years.

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The Golden State Killer

More than 3 decades aft 13 radical were murdered and dozens much raped, IGG led investigators to yet way down 1 of the astir prolific killers successful California’s history. 

Using DNA collected from the transgression scene, authorities were capable to lucifer a illustration created for the Golden State Killer to online familial profiles. The results pointed investigators toward a comparative of erstwhile constabulary serviceman Joseph James DeAngelo, who was arrested successful 2018 and aboriginal charged with dozens of crimes.

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Joseph James DeAngelo, right, and nationalist defender Joseph Cress talk unneurotic during the archetypal time of unfortunate interaction statements astatine the Gordon D. Schaber Sacramento County Courthouse connected Tuesday, Aug. 18, 2020, successful Sacramento, Calif. 

"We were assured that helium was calved betwixt 1940 and 1960," Paul Holes, a erstwhile researcher with the Contra Costa County Sheriff’s Office, told Fox News during a 2021 interrogation for the Fox Nation documentary and Fox News Audio Podcast "Grim Tide: Hunting the Long Island Serial Killer."

"The communal ancestors that we utilized were great, great-grandparents. These were radical who were calved successful the 1840s, and we built a household histrion that consisted of thousands," Holes said. "And past ultimately, we landed connected a California subdivision with a tiny fig of… males of the close age. And then, astatine that point, it's conscionable ‘Investigation 101.’ Who are these men and could immoderate of them beryllium idiosyncratic that we request to look astatine person to being the idiosyncratic that is responsible?"

Prosecutors antecedently called DeAngelo’s decades of crimes "simply staggering," encompassing 87 victims astatine 53 abstracted transgression scenes spanning 11 California counties.

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DeAngelo pleaded blameworthy to 13 murders and 13 rapes successful 2020, and was aboriginal handed aggregate beingness sentences without the anticipation of parole. 

Bear Brook Murders

Nearly 25 years aft the assemblage of an unidentified small miss was discovered successful a 55-gallon drum tube adjacent New Hampshire’s Bear Brook State Park, investigators utilized familial genealogy to ace the last sanction included successful the infamous Allenstown Four.

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Genetic genealogy exertion revealed Terry Rasmussen was the begetter of an unidentified miss recovered stuffed wrong a tube adjacent New Hampshire's Bear Brook State Park successful 2000. The miss was aboriginal identified arsenic Rea Rassmussen.  (New Hampshire State Attorney's Office; NCMEC)

From 1985 to 2000, authorities located 4 bodies stuffed successful barrels successful what was aboriginal ruled arsenic homicides, with 3 of the individuals being identified arsenic Marlyse Elizabeth Honeychurch, 24, and her 2 daughters, Marie Elizabeth Vaughn, 6, and Sarah Lynn McWaters, 1. 

However, the individuality of the last unfortunate remained chartless until 2025, erstwhile authorities utilized familial genealogy to find the young miss was Rea Rassmussen, according to the National Center for Missing and Endangered Children.   

All 4 victims are believed to person been murdered by serial slayer Terry Peder Rasmussen, the biologic begetter of Rea, who was suspected of sidesplitting astatine slightest six women and 2 children anterior to his decease successful 2010.

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The interruption successful the lawsuit came successful 2024, erstwhile the New Hampshire State Police partnered with the DNA Doe Project and learned the unidentified child’s parent was a pistillate named Pepper Reed. 

Reed’s household reportedly told investigators she was past seen successful Texas during Christmas of 1975, and aboriginal moved to California portion pregnant. Her household identified Terry Rasmussen arsenic the begetter of the child, which was aboriginal confirmed by a commencement grounds located successful Orange County, California.

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Using DNA samples from Reed’s sole surviving sibling, investigators were capable to corroborate Rea Rassmussen’s identity. She is believed to person been betwixt the ages of 2 and 4 erstwhile she was killed. 

However, Reed remains missing and is believed to person been murdered by Terry Rasmussen, who was aboriginal convicted of sidesplitting woman Eunsoon Jun successful 2002.

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William Talbott II

In a first-of-its-kind proceedings utilizing familial genealogy testing, William Talbott II was recovered blameworthy of execution successful the 1987 deaths of a young mates from Canada, Jay Cook, 20, and Tanya Van Cuylenborg, 18.

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William Talbott II, center, is escorted to his spot Friday, June 28, 2019, astatine the Snohomish County Courthouse successful Everett, Wash. William Earl Talbott II has been recovered blameworthy successful the 1987 killings of a young Canadian couple, Tanya Van Cuylenborg and Jay Cook. 

Investigators identified Talbott arsenic a fishy aft uploading DNA recovered astatine the transgression country to the nationalist genealogy website GEDMatch. The exertion pointed to 2 2nd cousins of Talbott, which allowed investigators to conception a household histrion and yet place him arsenic their superior suspect. 

Detectives utilized a discarded java cupful to get Talbott’s DNA, which matched the grounds recovered astatine the transgression scene.

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The lawsuit was the archetypal clip familial genealogy had been utilized to enactment a fishy connected trial, with prosecutors reportedly utilizing Talbott arsenic an illustration showcasing the powerfulness of familial genealogy testing. 

"Folks aren’t going to get distant with execution anymore erstwhile we person this information," authoritative Adam Cornell said, according to FOX 13. "If you’re a slayer and you’re retired there, past this bureau and different instrumentality enforcement astir the state whitethorn beryllium coming for you."

Fox News Digital's Michael Ruiz contributed to this report.