The mother of Luigi Mangione, the 26-year-old man charged in the New York killing of UnitedHealthcare’s CEO, reported her son missing in San Francisco weeks ago after believing he had been working in the city, according to a police source familiar with the investigation.

Mangione’s mother, Kathleen Mangione, called San Francisco police on Nov. 18, and stated that her son hadn’t been heard from since July, according to the source.

“Kathleen stated she spoke to Luigi on 7/1/24, and that Luigi worked for TrueCar at 124 Montgomery, which is permanently closed and the main number disconnected,” the report states.

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The police source spoke to the Chronicle on the condition of anonymity in order to discuss non-public details of the report. A second source said San Francisco police never had any contact with Mangione.

The mother went on to say that she didn’t know where her son frequents in the city, and the report does not note the presence of threats or medical concerns.

TrueCar announced the opening of an office at 140 New Montgomery St. in a 2015 press release. It was not clear on Tuesday if the company still operated out of that location. A TrueCar spokesperson told the Chronicle on Monday that Mangione hadn’t worked for the company since 2023, and did not immediately return a request for comment regarding the mother’s missing persons report.

The San Francisco Standard was first to report on the existence of Mangione’s missing persons report in San Francisco.

A spokesperson for San Francisco police declined to comment on any case involving Mangione, and referred all questions to the New York Police Department.

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Mangione's LinkedIn page, which remained online as of Tuesday states that he was living in Honolulu, Hawaii and working as a data engineer for TrueCar. Inc., which was based out of Santa Monica. It is unclear whether he was working for the company remotely, and a real estate news site in June reported that TrueCar was ending its headquarter's lease at a Santa Monica building.

Mangione on Monday was arrested on firearms charges after being spotted at a Pennsylvania McDonald’s, and he was subsequently charged with murder in the fatal shooting of UnitedHealthcare CEO Brian Thompson last week in New York City.

When announcing the arrest, New York officials on Monday noted that Mangione had ties to San Francisco and that his last known address was in Honolulu.

While police didn’t elaborate on the nature of Mangione’s connection to San Francisco, Stanford University confirmed that they employed him as head counselor at its Stanford Pre-Collegiate Studies program between May and September of 2019. A LinkedIn account under Mangione’s name also mentioned the job. Professors involved in the program did not respond to questions about whether they remembered Mangione.

A spokesperson with the Honolulu Police Department said it does not have any reports involving an individual named Luigi Mangione.

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On Nov. 12, 2023, Mangione was caught trespassing and ignoring signage at the Nuuanu Pali Lookout in Honolulu. Hawaiian prosecutors charged him with a petty misdemeanor and fined him $100. Mangione pleaded no contest and paid the fine early the following year, according to court records.

In a statement, Mangione’s family said they were “devastated” by his 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,” Delegate Nino Mangione, the suspect’s cousin, said in the statement.

Matthias Gafni contributed to this report.