The Fruitport Township Police Department said in a news release that the president of the manufacturing company Anderson Express Inc. was stabbed at about 9:20 a.m. on Tuesday at the company's address in Muskegon, about 35 miles northwest of Grand Rapids.
The police said a preliminary investigation found that a 32-year-old male employee stabbed Erik Denslow, the company president, in the side with a knife.
As of Tuesday afternoon, Denslow was said to be out of surgery and in serious but stable condition.
Anderson Express did not immediately respond to a request for comment from Business Insider.
The police said the suspect fled the scene in his vehicle before being stopped and taken into custody about 15 minutes later. They identified him as Nathan Joseph Mahoney.
Speaking with local media, the police said Mahoney had worked at the company for only about two weeks. The news release said fellow employees described him as having a "quiet demeanor."
Muskegon County Sheriff's Office records show Mahoney is being held on a more than $500,000 bond. He was arraigned Wednesday and charged with assault with intent to commit murder. Amy P. Campanelli, who is listed as Mahoney's attorney in charging documents, did not immediately respond to a request for comment.
Denslow has been president of Anderson Express for a little under two years, according to his LinkedIn profile.
Authorities are searching for a motive, including whether the attack was inspired by the killing of UnitedHealthcare's CEO, who was fatally shot earlier this month, leading to a widely publicized manhunt and the subsequent arrest of a suspect.
"We haven't ruled out copycat motive in regards to this," Fruitport Township's deputy police chief, Greg Poulson, told the local outlet News 8 on Wednesday.
He added: "We're going through all his social accounts, all his electronic media, and trying to determine a motive for this act."
Poulson also told News 8 that threatening CEOs and high-profile businesspeople "seems to be a popular thing in this day and age."
Correction: December 20, 2024 — An earlier version of this story misstated the location of Muskegon, Michigan. It's northwest, not northeast, of Grand Rapids.
Police arrested Mangione in Pennsylvania on December 9. He initially faced local gun and forgery charges. He's expected to be extradited to New York.
New York court documents show that in addition to one count of murder, he also faces two counts of second-degree criminal possession of a weapon, one count of second-degree possession of a forged document, and one count of third-degree criminal possession of a firearm.
Here's what to know about Mangione.
Mangione attended elite schools
Mangione graduated from the University of Pennsylvania in 2020.
He achieved a Bachelor of Science in engineering with a major in computer science and a minor in mathematics. He also received a Master of Science in engineering the same year with a major in computer and information science, a university spokesperson told Business Insider.
Before that, he attended Gilman School, an elite all-boys preparatory school in Baltimore. His yearbook entry, obtained by BI, says he was involved in robotics and Model United Nations.
In his valedictorian speech, Mangione praised classmates for "challenging the world" and thanked parents for sending their children to the fee-paying school, which he described as "far from a small financial investment."
He favorably reviewed the Unabomber Manifesto
On Goodreads, Mangione reviewed Ted Kaczynski's "Industrial Society and Its Future" book, also known as The Unabomber Manifesto, in early 2024. He gave it four out of five stars.
"He was a violent individual — rightfully imprisoned — who maimed innocent people," Mangione wrote. "While these actions tend to be characterized as those of a crazy luddite, however, they are more accurately seen as those of an extreme political revolutionary."
Mangione's review of the manifesto also quoted another online comment about the book, which appears to have originated on Reddit, praising the use of violence "when all other forms of communication fail."
"'Violence never solved anything' is a statement uttered by cowards and predators,'" Mangione quoted.
He founded an app and worked in tech
In 2015, while in high school, Mangione founded a company called AppRoar Studios. AppRoar released an iPhone game called "Pivot Plane" that's no longer available, but a reviewer in 2015 said it was "a fun little arcade game brought to you by 3 high school juniors."
He lived in a co-living space in Hawaii as recently as 2023.
He posed for photos indicating he participated in Greek life at the University of Pennsylvania.
The fraternity chapter represented in his photos couldn't be reached for comment.
A blog post on the University of Pennsylvania's website that was removed on December 9 said he cofounded a video game design club there.
Stephen Lane, a professor of video game design at the Ivy League university who didn't advise the club, told BI that "the fact he took the initiative and started something from nothing, that means at least in the context of Penn, that's a pretty good thing." He added, however, that Thompson's shooting was "obviously not a good thing."
Mangione's LinkedIn page says he worked as a data engineer at the vehicle shopping company TrueCar starting in 2020.
A TrueCar spokesperson told BI that Mangione hadn't worked for the company since 2023.
Online breadcrumbs and roommate say he dealt with back pain
At the top of Mangione's profile on X — formerly Twitter — is a triptych of three images: a photo of himself, smiling, shirtless on a mountain ridge; a Pokémon; and an X-ray with four pins or screws visible in the lower back.
The Pokémon featured in his cover image is Breloom, which has special healing abilities in the games.
Some of the books reviewed on Mangione's Goodreads account are related to health and healing back pain, including "Back Mechanic: The Secrets to a Healthy Spine Your Doctor Isn't Telling You" and "Crooked: Outwitting the Back Pain Industry and Getting on the Road to Recovery."
R.J. Martin, the founder of the co-living space in Hawaii, told the Honolulu Civil Beat that Mangione had suffered back pain from a misaligned vertebra that was pinching his spinal cord.
Martin told CNN that after leaving Hawaii, Mangione texted him to say he'd undergone surgery and sent him X-rays.
"It looked heinous, with just, giant screws going into his spine," Martin told the outlet.
It's not immediately clear whether the surgery was related to UnitedHealthcare.
Josiah Ryan, a spokesperson for the co-living space founder, told The Wall Street Journal that Mangione stopped replying to texts about six months ago and "sort of disappeared."
A YouTube spokesperson said that the platform had terminated Mangione's three accounts, adding that they had not been active for about seven months.
A senior police official told NBC New York on December 12 that Magione was never a UnitedHealthcare client and may have targeted Thompson because of the insurer's large size and outsize power. That same day, The Wall Street Journal reported that a company spokesperson said Magione was not a client.
Mangione was interested in AI
On his X account, Mangione posted and amplified posts about technological advances such as artificial intelligence. He also posted about fitness and healthy living.
He frequently reposted posts by the writer Tim Urban and the commentator Jonathan Haidt about the promise and perils of technology.
He also appeared to be a fan of Michael Pollan, known for his writing about food, ethics, and lab-grown meat.
On Goodreads, he praised Urban's book "What's Our Problem?: A Self-Help Book for Societies," describing it as "one of the most important philosophical texts of the early 21st century."
Urban posted to X on December 9: "Very much not the point of the book."
He was previously accused of trespassing
Before his arrest, Mangione had at least one encounter with the legal system. Hawaiian court records indicate that in 2023, he was accused of entering a forbidden area of a state park.
Mangione appears to have paid a $100 fine to resolve the matter.
Mangione comes from a wealthy and influential Baltimore family
Mangione is one of 37 grandchildren of the late Nick Mangione Sr., a prominent multimillionaire real-estate developer in Baltimore who died in 2008, The Baltimore Banner reported. Nick Mangione Sr. had 10 children, including Louis Mangione, Luigi Mangione's father.
Members of the Mangione family own the Turf Valley Resort in Ellicott City, Maryland, and Hayfields Country Club in Hunt Valley, Maryland.
One of Luigi Mangione's cousins is the Republican Maryland state legislator Nino Mangione, the Associated Press reported.
Representatives for Nino Mangione's office, in a statement to BI, declined to comment on the news of Luigi Mangione's arrest.
"Unfortunately, we cannot comment on news reports regarding Luigi Mangione," the statement read. "We only know what we have read in the media. Our family is shocked and devastated by Luigi's arrest. We offer our prayers to the family of Brian Thompson and we ask people to pray for all involved. We are devastated by this news."
The Mangione family has donated more than $1 million to the Greater Baltimore Medical Center, where all of Nick Mangione Sr.'s grandkids, including Luigi Mangione, were born, the Banner reported.
A public filing from 2022 for the nonprofit Mangione Family Foundation lists Louis Mangione as vice president.
He was arrested while on his laptop at a McDonald's, the police said
When the police in Altoona, Pennsylvania, responded to a McDonald's after a call about a suspicious person, they found Mangione sitting at a table looking at a silver laptop and wearing a blue medical mask, a criminal complaint said.
The complaint said that when asked for identification, Mangione gave police officers a New Jersey driver's license with the name "Mark Rosario."
When an officer asked Mangione whether he'd been to New York recently, he "became quiet and started to shake," the complaint said.
It added that Mangione correctly identified himself after officers told him he could be arrested for lying about his identity.
When asked why he lied, Mangione replied, "I clearly shouldn't have," the complaint said.
His motive is still not known, but police are analyzing his so-called manifesto
An internal NYPD report obtained by The New York Times said Mangione "likely views himself as a hero of sorts who has finally decided to act upon such injustices."
Mangione "appeared to view the targeted killing of the company's highest-ranking representative as a symbolic takedown and a direct challenge to its alleged corruption and 'power games,' asserting in his note he is the 'first to face it with such brutal honesty,'" according to the NYPD report by the department's Intelligence and Counterterrorism Bureau, the Times reported.
Moments before the December 10extradition hearing began, Mangione, handcuffed and wearing an orange prison jumpsuit, shouted out to the press as Pennsylvania police escorted him into the courthouse.
Mangione yelled out something partially unintelligible, saying something was "completely out of touch" and "an insult to the American people." He also shouted that something was a "lived experience" as a group of officers led him into the courthouse.
NYPD Chief of Detectives Joseph Kenny told NBC New York that Mangione had prior knowledge that UnitedHealthcare would be having its annual conference in New York City.
Mangione has retained a high-profile New York attorney
Thomas Dickey emerged as Mangione's attorney in Pennsylvania after his arrest in Altoona on December 9.
During a December 10 hearing at Pennsylvania's Blair County Courthouse, Dickey told the judge that Mangione was contesting his extradition to New York City.
Dickey later told reporters that Mangione would plead not guilty to all the charges in Pennsylvania. During an interview with CNN, Dickey said he expected Mangione to plead not guilty to the second-degree murder charge in New York and that he hadn't seen evidence that authorities "have the right guy."
Karen Friedman Agnifilo will represent Mangione in New York, a representative for Agnifilo Intrater LLP confirmed to Business Insider on Sunday.
Friedman Agnifilo worked as the chief assistant district attorney at the Manhattan District Attorney's Office from 2014 to 2021. She pivoted to private practice in 2021.
Do you know Luigi Mangione? Have a tip? Reach out to [email protected].
