Brown, who had traveled to Mexico, was deported Tuesday and taken into custody by US law enforcement officers near San Diego, the source said, based on an arrest warrant issued in Illinois. Police in San Diego are working to transfer Brown from Southern California to the Chicago area, the source said.
Brown is currently awaiting extradition to Maywood to face first-degree murder charges, the Maywood Police Department said in a news release.
Mexican law enforcement officers have known Brown's whereabouts since at least September 19, the source said, and deported him after authorities in Illinois finally obtained an arrest warrant pertaining to the death of Brown's mother.
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Authorities discovered the body of 73-year-old Myrtle Brown last month after relatives alerted police they'd been unable to find or contact her or her son, Maywood police said.
The Cook County Medical Examiner's Office determined Myrtle Brown died from injuries related to an assault, and the manner of death was ruled a homicide, according to spokesperson Natalia Derevyanny.
Sergio Brown, 35, played for Notre Dame before signing with the New England Patriots as an undrafted free agent in 2010. He played seven seasons in the NFL as a member of the Patriots, Indianapolis Colts, Jacksonville Jaguars and Buffalo Bills.
A statement was shared by Myrtle Jean Simmons-Brown's family Wednesday:
"Our family is thankful that the Cook County State's Attorney's Office answered our call for urgent and immediate action in the case of our beloved Myrtle Jean Simmons-Brown. We are also heartened by the news that Sergio Brown has been apprehended and returned to the United States unharmed. Our family is prayerful that, as the investigation progresses, more answers will become available, shedding light on the circumstances surrounding this heartbreaking incident."
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ABC7 Chicago contributed to this report.