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Grandpa ID’d as crazed killer who shot 9 of his kids, grandkids in shocking Pa. murder-suicide: relatives

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O’Neill, J. (2026, October 11). Grandpa ID’d as crazed killer who shot 9 of his kids, grandkids in shocking Pa. murder-suicide: relatives. New York Post. https://nypost.com/2026/10/11/us-news/grandfather-behind-trigger-of-pennsylvania-massacre/

Dated when The Aporia collected the article, usually within hours of publication. Check the original for its exact date and byline.

New York Post · collected 2026-10-11 · by Jesse O’Neill
Content note This article describes suicide or self-harm and sexual violence.

Quick Summary

A 45-year-old grandfather in Erie, Pennsylvania, killed nine family members, including his pregnant daughter Angelina Stone who was due to give birth soon, before taking his own life on Friday. The victims also included two women who rushed to help when shots were heard. Police found video and audio evidence showing gunshots inside the home prior to the killings outside. Authorities have not released the identity of the shooter or provided a motive, pending further investigation and notification of surviving family members.
Written by AI on 2026-10-11, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

On October 9, Matthew Stone Sr., a 45-year-old man in Erie, Pennsylvania, killed eight people before taking his own life. The victims included his wife and five children, along with two other women who had come to assist them. Police described the scene as one of the worst they have ever encountered, noting that the house was extremely filthy and filled with bottles of urine.

The shooting occurred after 9 pm when residents called 911 due to hearing gunfire; upon arrival, officers found two women dead outside the home. Stone barricaded himself inside and engaged in a standoff with police before dying from a self-inflicted gunshot wound. Inside the house, investigators discovered additional victims, including children.

Police revealed that Stone had exercised strict control over his family for years, managing their finances and restricting their movements. The home's conditions were described as deplorable, further highlighting the isolation and distress experienced by the victims.

Written for “Pennsylvania Shooting Leaves Nine Dead” on 2026-10-31, grounded in this article and the 30 other(s) covering the same event.

Story

📰 Pennsylvania Shooting Leaves Nine Dead
Crime & Law · 31 article(s) covering the same event. Compare every outlet's account →

Compared with similar articles

This article reads unscored and hedges 21% of its claims. Each row says how that neighbour differs.
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Hedges 0 of 4 claims Outlet record 64/100
Global News
Hedges 1 of 33 claims Outlet record 63/100
The Guardian
Hedges 2 of 38 claims Outlet record 66/100
ABC News (AU)
Hedges 0 of 4 claims Outlet record 68/100
NBC News
Hedges 3 of 11 claims Outlet record 60/100
Toronto Star
Hedges 1 of 3 claims Outlet record 64/100
New York Post
Hedges 3 of 15 claims Outlet record 66/100
How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
29
sentences that state something as happening or true
Uncertain
21%
6 of 29 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
66/100
New York Post's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
31
Crime & Law
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-10-11 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

New York Post · 15592 article(s) · 35 correction(s) detected
Running correction rate · 35 correction(s)

Who wrote this

Jesse O’Neill
22 article(s) here · 1 carrying a prediction
🔮 The towering 76-foot-tall tree is expected to be cut down late next week and driven some 200 miles to Manhattan several days later ahead of a nationally televised tree lighting ceremony Dec. 2.
🔮 The Memphis rapper, whose real name is Lontrell Williams Jr., was being held in solitary confinement for 23 hours a day and allotted only two visitation hours a month ahead of his trial on federal kidnapping and armed robbery charges
🔮 Noah Lara, 20, Wyatt Carr, 18, William Oldner, 19 and Tyler Fogg, 18, were all arrested on hazing charges, according to police.
🔮 The mom wept in court Friday as she was sentenced to stay indefinitely at a secure psychiatric hospital by a judge who accepted that her horrific act was “almost entirely attributable to mental disorder.” “It is my view you would not have done what you have if you were well,” Judge Thomas Linden told the mom during her sentencing.
🔮 The hero entered the classroom to see a teacher trying to pry a Maverick 88 pump-action 12-gauge shotgun away from the crazed killer — and opened fire several times on the teen before John could unload his 44 remaining rounds of ammunition, police said.
🔮 “There’s always a risk associated with it, no matter how skilled or well trained we are, we have to be so careful, and even then, something could still happen,” Jeremy Smith, 49, lead aviation tactics instructor for Airborne Tactical Training Solutions in Miami, told The Post Monday.
🔮 She did not discuss her purchase of the murder weapon but said, “If I could have prevented this, I would have.”
🔮 Scientists also found a repeating brightness cycle of about 4.4 days, which could line up with the day and night temperature variation of a massive planet orbiting very close to its star — at .04 Astronomical Units, or 25 times closer than the Earth is to the Sun.
🔮 She’s the most beautiful baby God could have created.”
🔮 Beleaguered train commuters Sunday began what is expected to be five weeks of severe delays and adjustments as construction ramps up on a replacement to a century-old bridge — a project that has continually brought headaches to customers.
Also by Jesse O’Neill
Nothing else under this byline is closely related to this article, so these are simply their most recent.
All 22 articles by Jesse O’Neill →

Topics

Erie Erie News Now New York Ohio Pennsylvania

Subjects

Angelina PERSON · 3× Erie GPE · 3× Erie News Now ORG · 2× Ezekiel PERSON · 2× Lisa Simmers PERSON · 2× Amari’anna PERSON · 1× Angelina Stone PERSON · 1× Isiah PERSON · 1× Kryie PERSON · 1× Pennsylvania GPE · 1×

Narrative

“Angelina’s father killed Angelina and her children in a murder-suicide, and now our family is facing the painful task of laying them to rest,” said an online fundraiser that had collected almost $24,000 by Sunday.
framing: mixed · carried by 1 article(s) · first seen 2026-10-11
🔮 She’s the most beautiful baby God could have created.”

Claims (29 extracted, 6 hedged)

The crazed killer in a mass murder-suicide in Pennsylvania was a grandfather who slaughtered nine of his own loved ones, including his young grandchildren and a daughter days away from giving birth again, according to horrified relatives. uncertain
who → slaughter → relatives
The 45-year-old suspect, who has yet to be fully identified, was found dead from a self-inflicted gunshot in the family home in Erie late Friday, with the murder weapon beside him, officials told Erie News Now. asserted
officials → have → News
After a shooting spree inside the house, he had stepped outside to gun down two women, ages 51 and 37, who rushed to the scene, before going back inside and killing himself, according to cops. uncertain
who → step → cops
The dead included Angelina Stone, the killer’s pregnant daughter who was days away from giving birth to a third child, Kryie, who was on Saturday added to the death toll, taking it to 10. asserted
who → include → 10
Her two other kids — son Isiah, 5, and daughter Amari’anna, almost 2 — were also killed. asserted
kids → kill → ?
“Angelina’s father killed Angelina and her children in a murder-suicide, and now our family is facing the painful task of laying them to rest,” said an online fundraiser that had collected almost $24,000 by Sunday. asserted
that → kill → Sunday
The fundraiser did not otherwise identify the killer dad, who has also not yet been identified by authorities. asserted
who → identify → authorities
But the father of one of Angelina’s slain children also told Erie News Now that the killer was his one-time partner’s dad “It was my baby, bro, and he just took her,” Ezekiel said. asserted
Ezekiel → slay → her
She’s the most beautiful baby God could have created.” uncertain
God → ’ → ?
Stone had already named her unborn child Kyrie, and was due to deliver him on Wednesday. asserted
Stone → name → Wednesday
“She was pregnant, about to have a baby in a couple of days and she had a daughter that was almost two, and her son Isaiah, who I believe was four or five,” Ezekiel’s sister Lisa Simmers told the outlet. asserted
sister → have → outlet
“They are all just beautiful children and definitely did not deserve what happened to them.” asserted
what → deserve → them
Erie cops have yet to suggest a motive, and said Sunday that identifications were being held because “surviving family members are still being notified.” asserted
members → have → motive
Another fundraising website had been set up for Lora Roberts, who organizers said was among those murdered. asserted
organizers → set → those
Roberts was remembered as “a loving mother of five, a devoted fiancée, a cherished daughter, family member, and friend to so many,” by organizers Kellie Eggleston and Christine Tombaugh. asserted
Roberts → remember → organizers
The mass shooting unfolded shortly before 5 p.m. on Friday in a home on the 700 block of Perry Road on the East Side of the lakeside city of 91,000 between New York and Ohio. asserted
shooting → unfold → York
Investigators uncovered video and audio evidence that showed gunshots were fired in the home before two “distressed” woman began pounding on the door of the house, police said. asserted
police → uncover → house
The 45-year-old family patriarch came outside and shot them dead before going back into the house, according to authorities. uncertain
patriarch → come → authorities
When cops arrived, they found the bodies of the women, ages 37 and 51, outside. asserted
they → arrive → women
After deploying a drone and a robot during a non-violent standoff, they entered the house to find the bodies of a 5-year-old boy and 1-year-old girl on the first floor. asserted
they → deploy → floor
Two women and two men were found dead in a stairwell and the body of the shooter was found upstairs, police said. asserted
police → find → shooter
It was the worst scene I have ever experienced,” Erie Police Chief Rick Lorah said at a press conference. asserted
Lorah → experience → conference
An outpouring of grief and support was seen at a candlelight vigil in front of the home Saturday night as community members lit candles, left balloons, and placed stuffed animals at the active scene. asserted
members → see → scene
“My son heard the first shot go off and then we heard the screaming, and then we heard the next three that went off as well. asserted
that → hear → three
So it was quite frightening for us to experience,” neighbor Candice Delange said at the growing memorial, according to WTAE-TV. uncertain
Delange → experience → TV
We heard the shots. asserted
We → hear → shots
We heard everything go down, step by step. asserted
everything → hear → step
We were here while we couldn’t run into the house and help the babies,” Lisa Simmers, a family member, reportedly asked. uncertain
Simmers → run → babies
“How do you go home and tell your kids like, hey, your mom, your siblings, your uncles and everybody else just got murdered by your grandpa?” asserted
mom → go → grandpa
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