Former NFL player Sergio Brown faces a first-degree murder charge in the death of his mother, according to the Cook County State's Office in Illinois. (Credit: Matt Dunham/AP/FILE)

(CNN) -- Former NFL player Sergio Brown pleaded not guilty Wednesday to murder and concealment of a body in the death of his mother in Illinois, according to the Cook County state's attorney's office.

Authorities accuse Brown of killing his 73-year-old mother, Myrtle Brown, and hiding her body near their shared home in the Chicago suburb of Maywood in September. Family members reported the couple missing on Sept. 16 and their body was found wrapped in a sheet less than 50 meters from the back door of the home, according to police and court documents.

A status hearing is scheduled for Jan. 24 in Maywood.

Brown had flown to Mexico on Sept. 15 and was apprehended by Mexican authorities in early October, prosecutors said. He was deported to San Diego and arrested by U.S. police on Oct. 10, and extradited to Maywood to face the charges, authorities said. In late October, an Illinois judge ordered Brown to be held without the possibility of bail, arguing that he posed a "real and present threat" to the community.

The Cook County Medical Examiner's Office determined that Brown's mother died from injuries related to an assault, and the manner of death was ruled homicide, office spokeswoman Natalia Derevyanny said.

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Myrtle Brown was killed by blunt force trauma and left outside her home, court documents prosecutors filed in October allege. The documents were included in Brown's bail offer, a procedure in which a defendant offers prosecutors information about a crime, sometimes as part of a plea deal.

Myrtle Brown's other son, whose name is not listed in court documents, last spoke to her around 3 p.m. on Sept. 14 and began to worry after she stopped responding to his text messages, according to the documents.

That son checked the home early in the morning of Sept. 16 and found the house empty, with no signs of forced entry, according to the documents. Police searched the home later that day after family members reported Myrtle and Brown missing when they had been unable to find or contact them, police said.

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When neighbors began searching the surrounding area for Brown and his mother, a former neighbor found her body near the home, according to court documents.

A search of the home revealed an Ajax cleaner in the bathtub drain, indicating it had been recently cleaned, the offer said. Myrtle Brown's iPad, credit cards and phone were missing, according to the documents.

Surveillance cameras in the area also captured Brown burning items in a fire pit on the night of Sept. 14, and police later found burnt cloth in that same fire pit, according to the documents.

Sergio Brown played defensive back for the University of 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.

CNN's Bill Kirkos and Emma Tucker contributed to this report.