Weeks Before 'Brazen' Shooting in New York City, Suspect Luigi Mangione's Mom Reported Him Missing

The man accused of killing UnitedHealthcare CEO Brian Thompson and prompting a multi-day manhunt was reported missing by his mother on Nov. 18, a senior law enforcement official tells PEOPLE.

Police in Altoona, Pa., arrested Luigi Mangione on Monday, Dec. 9, after the 26-year-old was recognized in a McDonald's from photos released by the New York City Police Department over the weekend, identifying him as a person of interest in the early morning killing of healthcare CEO Brian Thompson on Dec. 4.

PEOPLE confirmed Monday that Mangione, a former high school valedictorian and University of Pennsylvania computer science graduate, was charged with one count of murder, 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.

A senior law enforcement official tells PEOPLE that Mangione’s mother Kathleen Mangione reported her son missing to the San Francisco Police Department. Six months before earlier, Mangione had cut off contact with his family and friends, the official says.

Related: Luigi Mangione’s First Jail Photos Released as His Family Says They’re ‘Shocked and Devastated’ After Arrest

CNN also reported that Mangione appeared to mostly vanish from social media over the summer, according to friends and family. The outlet reported that he had posted often online, sharing photos of his travels and documenting reviews of more than 300 books he'd read, before seemingly halting his posts over the summer.

The sudden lapse in communication prompted one follower on X to reach out and tag him in a concerning post this past October: “Nobody has heard from you in months, and apparently your family is looking for you,” the user posted, according to CNN, adding, “I don’t know if you are okay.”

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Another user wrote that they hadn’t heard from Mangione “in months,” according to the outlet, and referenced Mangione going radio silent on them regarding “commitments” he'd made to help with their wedding. A third user messaged Mangione publicly, telling him they were “thinking” of him and adding, “know you are missed and loved,” CNN and The New York Times both reported.

Related: Luigi Mangione Had 'Debilitating' Back Pain, Went 'Radio Silent' to Friends Before Healthcare CEO Shooting: Reports

The Times reported that Mangione’s arrest shocked the Maryland community in which he grew up.

While one former colleague of Mangione’s told CNN they were “flabbergasted” by his arrest, another family friend, lawyer and local radio host Thomas J. Maronick Jr., told the Times that he was “just the last person you would suspect” of being arrested for murder.

The Times described Mangione’s family as wealthy and well-connected in the local Baltimore community, which includes a cousin of the suspect's, Nino Mangione, who is an elected member of the Maryland House of Delegates.

“It is just such a well-respected family and such a prominent family within Baltimore County,” Maronick Jr. said, expressing his disbelief.

“Our family is shocked and devastated by Luigi’s arrest,” Nino Mangione said in a statement obtained by PEOPLE on Monday. “We are devastated by the news.”

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