UnitedHealthcare CEO killing: Luigi Mangione's mom filed missing person report in San Francisco, sources tell ABC News

Sources informed ABC News that the mother of the suspect in the murder of UnitedHealthcare CEO Brian Thompson had reported her son missing in San Francisco in November.

MORE: UnitedHealthcare CEO shooting suspect inspired by Unabomber: NYPD analysis

Luigi Nicholas Mangione was taken into custody on Monday for the assault on Thompson on December 4. Police were notified by an employee at a McDonald’s in Altoona, Pennsylvania, who recognized a customer resembling the suspected shooter. Mangione was found with a firearm believed to be the one used in the attack, as well as writings expressing frustration towards corporate America.

When asked about the report, SFPD referred ABC News to the NYPD.

Besides this incident, Mangione had ties to the Bay Area. According to ABC7 News I-Team reporter Dan Noyes, Mangione served as a lead counselor at Stanford in 2019. He had previously attended a prestigious high school in Baltimore and obtained both his bachelor’s and master’s degrees in Pennsylvania.

RELATED: UnitedHealthcare CEO killing: What we know about suspect’s ties to Bay Area

After his time at Stanford, Mangione headed off to a job in computer programming.

Mangione, who was arrested in Pennsylvania on Monday and faces charges in New York including second-degree murder, is challenging his extradition. His defense was given 14 days to file a formal challenge.

The Associated Press contributed to this report.

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