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MICHAEL RUIZ: Cold case DNA unmasks 'Montauk Mary' as cops probe link to Jersey Shore 'Thrill Killer'

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Cite

Ruiz, M. (2026, November 13). MICHAEL RUIZ: Cold case DNA unmasks 'Montauk Mary' as cops probe link to Jersey Shore 'Thrill Killer'. Fox News. https://www.foxnews.com/us/michael-ruiz-cold-case-dna-unmasks-montauk-mary-cops-probe-link-jersey-shore-thrill-killer

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Fox News · collected 2026-11-13 · by Michael Ruiz analysis
Content note This article describes violence described in detail.

Quick Summary

Cold case detectives in Suffolk County, New York, have identified an unidentified woman known as "Montauk Mary," found dead in 1978, as Sofia Margherita Marrone from New Jersey. Using new DNA methods, they suspect she may have been a victim of Richard Biegenwald, the "Thrill Killer," who was imprisoned for six murders between 1958 and 1982. Marrone was last seen alive on March 16, 1978, and her body was found six days later with bullet wounds consistent with Biegenwald's weapon. The article highlights the cold case task force's success in solving long-standing mysteries and emphasizes the continued investigation into Marrone's death.
Written by AI on 2026-11-14, from this article's own text only (the story summary below draws on all the coverage).
See how they differ ↓

AI analysis

Story summary

Sofia Margherita Marrone, known as "Montauk Mary," was identified by Suffolk County investigators on November 13, 2026, nearly 48 years after her body was discovered. She was found on March 22, 1978, by a U.S. Airman near Camp Hero radar tower in Montauk, New York, and her death was linked to Richard Biegenwald, a notorious serial killer associated with nine murders, six of which he was convicted of in New Jersey. Marrone was shot four times, including three bullet wounds to her legs and one to her chest, and her body was found just hours after her death. She was last seen leaving a hospital in Somers Point, New Jersey on March 16, 1978, before her murder near East Overlook Park in Montauk. The identification was made possible through new DNA methods, providing closure in a cold case that had puzzled investigators for decades.

Written for “Serial Killer Linked Through DNA” on 2026-11-14, grounded in this article and the 1 other(s) covering the same event.

How they differ

2 outlets covered “Serial Killer Linked Through DNA”.

What each outlet says

One AI summary per outlet of its latest article on this story, written from that article alone and checked against it. Open the article for the outlet's own words.

Fox NewsThis outlet13 Nov

Cold case detectives in Suffolk County, New York, have identified an unidentified woman known as "Montauk Mary," found dead in 1978, as Sofia Margherita Marrone from New Jersey. Using new DNA methods, they suspect she may have been a victim of Richard Biegenwald, the "Thrill Killer," who was imprisoned for six murders between 1958 and 1982. Marrone was last seen alive on March 16, 1978, and her body was found six…

MICHAEL RUIZ: Cold case DNA unmasks 'Montauk Mary' as cops probe link to Jersey Shore 'Thrill Killer' (this article)
Toronto Sun14 Nov

Detectives have identified the body of "Montauk Mary," an unidentified woman found in a wooded area in New York in 1978, as 73-year-old Sofia Margherita Marrone of New Jersey. The investigation concludes that Marrone was murdered by Richard Biegenwald, a serial killer known as the "Jersey Shore Thrill Killer" who was linked to at least nine murders between 1958 and 1982. This report focuses on the cold case…

CRIME HUNTER: Serial killer Richard Biegenwald returns from depths of hell →

Compared with similar articles

This article reads unscored and hedges 10% of its claims. Each row says how that neighbour differs.
Toronto Sun
Hedges 1 of 48 claims Outlet record 96/100
New York Post
Hedges 4 of 17 claims Outlet record 66/100
“While both articles discuss cold case identifications using DNA and mention a possible link to the 'Thrill Killer', Article A talks about identifying remains of six victims dating back 50 years, while Article B focuses on a specific victim, Sofia Margherita Marrone, known as 'Montauk Mary'.”

Story

Serial Killer Linked Through DNA
Crime & Law · 2 article(s) covering the same event. See how they differ ↑
How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
39
sentences that state something as happening or true
Uncertain
10%
4 of 39 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
67/100
Fox News's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
2
Crime & Law
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-11-14 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

Fox News · 7706 article(s) · 14 correction(s) detected
Running correction rate · 14 correction(s)

Who wrote this

Michael Ruiz
46 article(s) here · 1 carrying a prediction
On March 22, 1978, the Airman saw Marrone's body near the Camp Hero radar tower that decades later would inspire Netflix's "Stranger Things."
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The judge overseeing the case against accused assassin Tyler Robinson will announce his ruling Monday after prosecutors and defense attorneys sought dramatically different start times for the trial of a man accused of gunning down Charlie Kirk last year.
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His accused killer, Tyler Robinson, is due in court Monday for a hearing that could see a trial date set.
Jacob Allen Morley broke out of the Northwest Correctional Complex in Tiptonville, Tennessee, on Oct. 25, officials there said previously. Details about his capture were not immediately available, but the spokesperson said more information would be forthcoming.
The University of Idaho student massacre survivor who came face-to-face with a masked man believed to be Bryan Kohberger is asking a Latah County judge to press pause on an order granting the release of video and images that could show her face in a firsthand letter describing how the trauma has upended her life.
A Utah Supreme Court battle stemming from Gabby Petito's 2021 murder could "pave the way" for Charlie Kirk's family to pursue a wrongful death lawsuit over alleged security failures surrounding his assassination at a Turning Point USA event last year, according to an attorney involved in the appeal.
Also by Michael Ruiz
Nothing else under this byline is closely related to this article, so these are simply their most recent.
All 46 articles by Michael Ruiz →

Topics

Montauk Montauk Mary New Jersey Suffolk County the Great Depression

Subjects

Marrone PERSON · 6× New Jersey GPE · 4× Biegenwald PERSON · 3× Jane Doe PERSON · 3× Montauk GPE · 3× Suffolk County GPE · 3× Tierney PERSON · 3× Riverhead GPE · 2× U.S. GPE · 2× Sofia Margherita Marrone PERSON · 1×

Narrative

A contemporary witness had also reported seeing a man with a beard sitting in a gold-colored car with New Jersey plates near the Montauk park where Marrone's remains were found, Tierney said, adding that Biegenwald was known to have a beard and had multiple vehicles, including one that roughly matched the witness' description.
framing: assertive · carried by 1 article(s) · first seen 2026-11-14
On March 22, 1978, the Airman saw Marrone's body near the Camp Hero radar tower that decades later would inspire Netflix's "Stranger Things."

Claims (39 extracted, 4 hedged)

She survived the Great Depression only to vanish in 1978 and remain an unidentified Jane Doe until nearly a half-century later, when cold case detectives identified her as a possible victim of the Jersey Shore's infamous "Thrill Killer." asserted
detectives → survive → Killer
Sofia Margherita Marrone had been known for years only as "Montauk Mary" due to where she had been found by a U.S. Airman on his lunch break in a park near the eastern end of Montauk in the town of East Hampton, New York. asserted
she → know → Hampton
On March 22, 1978, the Airman saw Marrone's body near the Camp Hero radar tower that decades later would inspire Netflix's "Stranger Things." asserted
that → see → Things
On Thursday, investigators in Suffolk County identified her as the victim of a shooting 250 miles away from where she had last been seen. asserted
she → identify → shooting
They said she had been shot and killed just hours before being found. asserted
she → say → ?
Marrone, of Pleasantville, New Jersey, was last seen leaving a hospital in Somers Point, New Jersey, on March 16, 1978. asserted
Marrone → see → March
She was killed six days later at East Overlook Park in Montauk. asserted
She → kill → Montauk
The autopsy found three bullet wounds in her legs and one to her chest. asserted
autopsy → find → chest
Her identity remained unknown until Suffolk County investigators said they uncovered it with new DNA methods. asserted
they → remain → methods
They said she may have been a victim of Richard Biegenwald, also known as the Jersey Shore "Thrill Killer." uncertain
she → say → Killer
Biegenwald died in prison in 2008, serving life sentences for killing six people between 1958 and 1982, Suffolk County District Attorney Ray Tierney said Thursday. asserted
Tierney → die → 1958
He had been suspected in three other murders as well. asserted
He → suspect → murders
Marrone had been killed with the same rare .22-caliber short rounds Biegenwald was using when New Jersey police arrested him in 1983, Tierney told reporters. asserted
Tierney → kill → reporters
He had been known to pick up victims he encountered walking in towns along the Jersey Shore. asserted
he → know → Shore
A contemporary witness had also reported seeing a man with a beard sitting in a gold-colored car with New Jersey plates near the Montauk park where Marrone's remains were found, Tierney said, adding that Biegenwald was known to have a beard and had multiple vehicles, including one that roughly matched the witness' description. asserted
that → report → description
Still, authorities stopped short of calling the case solved. asserted
authorities → stop → case
Marrone is among six victims recently identified by a cold case task force that retired NYPD cold case sergeant Joseph Giacalone said could become a model for law enforcement around the country. uncertain
Giacalone → identify → country
"The district attorney has laid out a plan nationally that others should follow," he told Fox News Digital Friday. asserted
he → lay → Digital
"Between establishing the cold case squad within the DA’s office, bringing in the federal and state partners, spending the money on cases that can be solved, and never giving up." asserted
that → establish → cases
Three of the six recently identified Does are believed to have been homicide victims, according to Tierney's office. uncertain
Three → identify → office
One is believed to have drowned accidentally, and the cause of the final death remains under investigation. asserted
cause → believe → investigation
Authorities identified Marrone along with five other cold case victims Thursday. asserted
Authorities → identify → victims
The others were: - Antionette Rugg, previously known as the Hecksher Jane Doe — A dog walker discovered her skeletal remains buried in the sand at Heckscher State Park on April 2, 1978. asserted
walker → know → April
She was found with a belt tightly cinched around her throat, prosecutors said. asserted
prosecutors → find → throat
She was 26 years old and had a 10-year-old son. asserted
She → have → son
- Ramon Perez y Rivera, previously known as Raymond Doe — A group of rabbit hunters found his remains in Deer Park on Nov. 27, 1976. asserted
group → know → Nov.
He had been severely burned and had a gunshot wound in his abdomen. asserted
He → burn → abdomen
- Kyong-Ok Kim, previously known as the Riverhead Jane Doe — A street sweeper found her body off Osborne Avenue in Riverhead on March 12, 1990. asserted
sweeper → know → March
The cause of her death remains under investigation. asserted
cause → remain → investigation
She was originally from South Korea but immigrated to the U.S. and lived in Woodside, Queens. asserted
She → immigrate → Woodside
She had a 12-year-old son and was 32 years old at the time of her death. asserted
She → have → death
The U.S. Coast Guard found an unidentified body in the water 9 miles south of Fire Island on Nov. 4, 1990. asserted
Guard → find → Nov.
Steward, 28, is believed to have drowned. asserted
Steward → believe → ?
- Andreas Kupke, John Doe — The 27-year-old German national had traveled to the U.S. for a 10-day vacation in the fall of 1999. asserted
national → travel → 1999
He never made his return flight. asserted
He → make → flight
On Christmas Eve of that year, police found his partially decomposed remains alongside a high tide marker in Montauk. asserted
police → find → Montauk
Kupke's cause of death remains unclear. uncertain
cause → remain → death
"Every person deserves to be known by their name, and every victim deserves answers and justice," Tierney said in a statement. asserted
Tierney → deserve → statement
"Five decades have passed since the first of these individuals was found deceased, but our commitment to identifying them and pursuing justice has never wavered." asserted
commitment → pass → justice
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