Luigi Mangione, the man suspected of fatally shooting UnitedHealthcare CEO Brian Thompson, was apprehended in Altoona, Pennsylvania, on Monday. Authorities revealed that Mangione, 26, left behind a handwritten manifesto decrying the health insurance industry, particularly UnitedHealthcare, which he accused of prioritizing "immense profit" over the well-being of Americans.

"The reality is, these [companies] have gotten too powerful, and they continue to abuse our country for immense profit," Mangione wrote in the two-and-a-half-page document addressed to "the Feds," according to sources familiar with the investigation.

Mangione's arrest followed a dramatic series of events. Pennsylvania police were alerted by a McDonald's customer who recognized him from media reports. Officers found him sitting in the restaurant, wearing a blue medical mask and using a laptop. Upon questioning, Mangione initially provided a fake New Jersey ID matching the one reportedly used by the suspect to check into a Manhattan hostel before the shooting.

NYPD Commissioner Jessica Tisch confirmed the discovery of items consistent with the December 4 shooting of Thompson, including a ghost gun with a suppressor, clothing matching the suspect's description, and the manifesto. "It does seem that he has some ill will toward corporate America," said NYPD Chief of Detectives Joseph Kenny.

Mangione reportedly acted alone, as indicated in his writings, and apologized for the trauma caused. "I do apologize for any strife or traumas, but it had to be done," he wrote. "Frankly, these parasites simply had it coming."

The arrest marks a significant development in the investigation of the murder, which sent shockwaves through both the corporate and healthcare sectors. Thompson, 50, was shot execution-style in broad daylight in Midtown Manhattan, a crime that underscored heightened tensions surrounding corporate practices in the healthcare industry.

Mangione, a University of Pennsylvania graduate with dual engineering degrees and a former employee at TrueCar, was described as a brilliant yet troubled individual. His LinkedIn profile highlighted achievements such as founding a video game development club and serving as valedictorian at the prestigious Gilman School in Baltimore. However, his recent online activity painted a darker picture, including a glowing review of Theodore Kaczynski's Industrial Society and Its Future, the manifesto of the infamous Unabomber.

Police also noted Mangione's deep disdain for the healthcare industry, citing social media posts that included the quote, "It is no measure of health to be well-adjusted to a profoundly sick society." Investigators are now scrutinizing whether his personal experiences with healthcare influenced his motivations.

Mangione's life appeared to unravel in recent years, with friends on social media expressing concern over his sudden disappearance. "Nobody has heard from you in months," one post from October read. Another from July questioned if he was in an "isolated place" with no service.

Authorities are continuing to examine Mangione's connections, including his ties to a prominent Maryland family involved in real estate, healthcare, and country clubs. A relative, Maryland state Delegate Nino Mangione, has not commented on the allegations.

Charged with multiple offenses, including forgery and firearms violations, Mangione faces additional charges related to Thompson's murder in New York. Pennsylvania State Police Lt. Col. George Bivens described Mangione as initially cooperative but noted his demeanor shifted during questioning. "He became visibly nervous, kind of shaking," said Altoona Deputy Police Chief Derek Swope.

The case continues to develop as investigators delve deeper into Mangione's motives and background. Meanwhile, UnitedHealthcare has not commented publicly, but the murder has intensified discussions around the growing scrutiny of corporate healthcare practices in America.