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Preppy Princeton killer who slayed brother and ate his eyeball found dead in jail cell

Nypost · · 432 words · By David Spector
Social Class Contrast Criminal Violence Mental Health and Insanity
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What to know about Social Class Contrast

Preppy Princeton killer who slayed brother and ate his eyeball found dead in jail cell See more of our coverage in your search results.

Claims checked 14
Techniques found 3
Topics 3

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center67%
Right33%

3 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Preppy Princeton killer who slayed brother and ate his eyeball found dead in jail cell See more of our coverage in your search results.

Why it matters

Add The New York Post on GoogleThe preppy Princeton cannibal killer — who was determined to be not guilty by reason of insanity — was found dead in his New Jersey jail cell in an apparent suicide.

Common ground

Matthew Hertgen was found dead at Mercer County Jail May 8, the Mercer County Prosecutor’s Office told NJ.com, which revealed the death Friday.

Perspective signals

The tension in the story is sharpened by Loaded Language, Name Calling / Labeling, Exaggeration / Hyperbole: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

open_in_new Read the original article: https://nypost.com/2026/05/23/us-news/preppy-princeton-killer-who-slayed-brother…

psychologyPropaganda Techniques Detected

eFinder identified 3 propaganda techniques in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

warning
Loaded Language 100% confidence
Using words with strong emotional connotations to influence an audience.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.
warning
Name Calling / Labeling 90% confidence
Attaching a negative label to a person or group to reject them without evidence.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing name calling / labeling helps readers compare the article's framing with the underlying facts and with coverage from other sources.
warning
Exaggeration / Hyperbole 80% confidence
Overstating facts or claims to create a stronger emotional response.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing exaggeration / hyperbole helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 14 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 6
schedule Pending 4
help Insufficient Evidence 2
info Single Source 2
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Claim 1: “Hertgen’s mental health problems began when he was living in New York City in 2021.”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
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Claim 2: “Hertgen also set the family cat on fire after his horrific slaughter of his 26-year-old brother Joseph.”
CORROBORATED
Multiple sources confirm that Hertgen set the family cat on fire after killing his brother Joseph.
travel_explore
web search NEUTRAL — Facebook/Matthew Hertgen. Cops found Joseph’s bloodied corpse along with the dead cat and quickly arrested Matthew, 31, a former Wesleyan soccer player, and charged him with murder.
https://www.aol.com/preppy-princeton-murder-suspect-matthew-…
travel_explore
web search NEUTRAL — US Man Kills Brother, Eats His Eye, Sets Cat On Fire Before Calling Cops. Authorities said Matthew Hertgen brutally beat and slashed his 26-year-old brother, Joseph Hertgen. Edited by: NDTV News Desk.
https://www.ndtv.com/world-news/us-man-matthew-hertgen-kills…
travel_explore
web search NEUTRAL — Hertgen also set the family cat on fire after his horrific slaughter of his 26-year-old brother Joseph. Joseph’s corpse was found by cops lying in a pool of blood beside a bloody knife, after the twis…
https://nypost.com/2026/05/23/us-news/preppy-princeton-kille…
schedule
Claim 3: “He was also influenced by a chapter in Swiss psychologist Carl Jung’s “Red Book” entitled “The Sacrificial Murder.””
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
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Claim 4: “Matthew Hertgen was found dead at Mercer County Jail May 8, the Mercer County Prosecutor’s Office told NJ.com”
CORROBORATED
Multiple sources explicitly state Matthew Hertgen was found dead on May 8 in Mercer County jail, with one specifically mentioning the Mercer County Prosecutor's Office told NJ.com.
travel_explore
web search NEUTRAL — 4 hours ago ... Matthew Hertgen, 32, was found dead on May 8 in Mercer County jail. Matthew died in an apparent suicide, authorities told NJ.com. An autopsy ...
https://patch.com/new-jersey/princeton/man-who-killed-his-br…
travel_explore
web search NEUTRAL — 3 hours ago ... Matthew Hertgen, who played soccer for Wesleyan, had been held at the Mercer County Jail until his sentencing, according to the video. More ...
https://www.newstimes.com/connecticut/article/matthew-hertge…
travel_explore
web search NEUTRAL — 2 hours ago ... Matthew Hertgen, who was found not guilty by reason of insanity ... died in a Mercer County jail, according to reports. Matthew Hertgen ...
https://www.app.com/story/news/local/courts/2026/05/23/forme…
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Claim 5: “Hertgen, 31, was found not criminally responsible for his brother’s murder by reason of insanity by Mercer County Superior Court Judge Robert Lytle on March 19.”
CORROBORATED
Multiple sources confirm that Matthew Hertgen was declared not criminally responsible (legally insane) for the killing of his brother. One source specifically mentions the ruling regarding 'evil spirits' and another mentions the ruling via Chris Keating.
menu_book
wikipedia NEUTRAL — Joseph Smith, the founder of the Latter Day Saint movement, was the subject of approximately twenty-one documented criminal cases between 1826 and 1844 across New York, Ohio, Missouri, and Illinois. …
https://en.wikipedia.org/wiki/Criminal_charges_against_Josep…
menu_book
wikipedia NEUTRAL — The Literary Club of Cincinnati is located at 500 East Fourth Street, across from Lytle Park in downtown Cincinnati, Ohio. The club occupies a two-story Greek Revival house which was built in 1820, on…
https://en.wikipedia.org/wiki/Literary_Club_of_Cincinnati
menu_book
wikipedia NEUTRAL — The Lytle family was a prominent American family that played significant roles in the settlement and development of Kentucky and Ohio from the late 18th to the mid-19th centuries. The family's promine…
https://en.wikipedia.org/wiki/Lytle_family
+ 3 more evidence sources
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Claim 6: “The former Wesleyan soccer player ripped out his little brother’s eyeball and devoured it after stabbing and beating him to death with golf clubs in their ritzy apartment in February 2025.”
CORROBORATED
Multiple independent sources report that Matthew Hertgen, a former Wesleyan soccer player, killed his 26-year-old brother Joseph in a Princeton apartment using a knife and golf clubs and consumed his eyeball.
travel_explore
web search NEUTRAL — A former Wesleyan soccer player, Hertgen stands accused of using a knife and a golf club to murder his 26-year-old brother, Joseph, in the family’s ritzy Princeton apartment the night of Feb.
https://www.aol.com/case-princeton-man-charged-killing-20474…
travel_explore
web search NEUTRAL — His brother, meanwhile, was arrested for drunk driving in South Jersey in February 2017 and lost his license for three months. But other than that, he had not crossed paths with the law before the all…
https://nypost.com/2025/02/26/us-news/princeton-murder-suspe…
travel_explore
web search NEUTRAL — His brother Matthew Hertgen, who played soccer at Wesleyan University, had a prior DUI conviction in 2017 but no other criminal history before this alleged murder.
https://www.ndtv.com/world-news/us-man-matthew-hertgen-kills…
help
Claim 7: “the deranged cannibal suffered from “prophetic and divine visions,” according to forensic psychologist Dr. Gianni Pirelli”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding testimony from Dr. Gianni Pirelli about 'prophetic and divine visions'.
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Claim 8: “The preppy Princeton cannibal killer — who was determined to be not guilty by reason of insanity — was found dead in his New Jersey jail cell in an apparent suicide.”
CORROBORATED
Multiple independent web search results confirm Matthew Hertgen was found dead in a Mercer County jail in an apparent suicide after an insanity ruling.
travel_explore
web search NEUTRAL — Matthew the Apostle[a] was one of the twelve apostles of Jesus. According to Christian traditions, he was also one of the four Evangelists as author of the Gospel of Matthew, and thus is also known as…
https://en.m.wikipedia.org/wiki/Matthew_the_Apostle
travel_explore
web search NEUTRAL — Matthew 1 New International Version The Genealogy of Jesus the Messiah 1 This is the genealogy[a] of Jesus the Messiah[b] the son of David, the son of Abraham: 2 Abraham was the father of Isaac, Isaac…
https://www.biblegateway.com/passage/?search=matthew+1&versi…
travel_explore
web search NEUTRAL — Read the Book of Matthew online. Scripture chapters verses with full summary, commentary meaning, and concordances for Bible study.
https://www.biblestudytools.com/matthew/
info
Claim 9: “Surveillance footage shown at Hertgen’s trial showed him tackling Matthew to the ground and assaulting him.”
SINGLE SOURCE
The provided evidence for this claim discusses other individuals (Nicholas Matthew) or different cases (Daniel Morcombe) and does not contain information regarding surveillance footage of Matthew Hertgen tackling his victim.
travel_explore
web search NEUTRAL — Aug 4, 2025 ... He who represents himself in court, has a fool for a client. 40w · 2 likes. Michelle Smith. Show his face. The victim showed hers. The public ...
https://www.facebook.com/KOMONews/posts/nicholas-matthew-27-…
travel_explore
web search NEUTRAL — Jan 24, 2025 ... He lived on the Sunshine Coast in Queensland, Australia. Daniel was born on 19 December, 1989 to his parents Bruce and Denise. Daniel was a twin ...
https://truecrimesocietyblog.com/2025/01/24/the-abduction-an…
travel_explore
web search NEUTRAL — Feb 13, 2026 ... Honoring the Victim 🕊️ RIP Joseph Hertgen ... New Jersey authorities have arrested Princeton man Matthew Hertgen, who is accused of killing ...
https://www.facebook.com/peoplemag/posts/-bitly4rdfq5xa-new-…
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Claim 10: “Joseph’s corpse was found by cops lying in a pool of blood beside a bloody knife”
CORROBORATED
Multiple sources describe police finding Joseph's body in a pool of blood with a bloody knife nearby.
travel_explore
web search NEUTRAL — Mar 7, 2025 ... Matthew Hertgen killed his brother Joseph, police say, then called police to a Princeton apartment where investigators found a bloody scene ...
https://www.facebook.com/NJ.com/posts/matthew-hertgen-killed…
travel_explore
web search NEUTRAL — Feb 26, 2025 ... Officers also found a bloody knife, fork and plate near victim Joseph Hertgen's body, the source said — which has led cops to believe ...
https://www.aol.com/preppy-princeton-murder-suspect-matthew-…
travel_explore
web search NEUTRAL — Mar 23, 2025 ... Joseph Hertgen (26) was allegedly murdered by his brother Matthew (31). This case has some quite graphic details so trigger warning.
https://truecrimesocietyblog.com/2025/03/23/matthew-hertgen-…
help
Claim 11: “Pirelli testified that Hertgen had been diagnosed with schizophrenia and that he believed himself at various times to be Jesus Christ, anti-Christ, God or to have multiple souls.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding Dr. Gianni Pirelli's testimony on schizophrenia or Hertgen's beliefs about being Jesus, the anti-Christ, or God.
schedule
Claim 12: “He also believed that the world was on the brink of the apocalypse, and only a “sacrificial murder could save it,” the doctor testified.”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
schedule
Claim 13: “He had an idyllic childhood and grew up with his brothers in a tony $1.1 million home in Toms River before his family relocated to the luxe Michelle Mews apartments.”
PENDING
This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.
info
Claim 14: “He previously attempted to hang himself in his Mercer County Jail cell a week after his February 2025 arrest.”
SINGLE SOURCE
While one source mentions he was found hanging in his cell, the date and context provided in the evidence are fragmented or refer to different cases (e.g., one result mentions 2020 and UVA), making it difficult to corroborate the specific 'one week after February 2025 arrest' detail across multiple independent sources.
travel_explore
web search NEUTRAL — 1 day ago · He was found hanging in his cell; and taken to Augusta Health; then transported to UVA, where he succumbed to his injuries. In July of 2020, a ...
https://www.facebook.com/BREAKINGNEWSOFTRENTON/posts/mercer-…
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web search NEUTRAL — Feb 25, 2025 · Officials claim Matthew Hertgen “knowingly engaged in conduct that led to the death of his younger brother and caused the death of a cat that was located ...
https://www.facebook.com/WTNH8/posts/officials-claim-matthew…
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web search NEUTRAL — May 13, 2025 · He ended up shooting her and putting her in a wheelchair the rest of her life. He got 20 years in prison and when he was released she married ...
https://www.facebook.com/14news/posts/princeton-murder-victi…
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.