Ex-NFL player Sergio Brown pleads not guilty to killing his mother

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Former NFL wide receiver Sergio Brown pleaded not guilty on Wednesday to the murder of his mother.

Myrtle Brown was last seen alive in the early evening of Sept. 14 at her home. Two days later, after not hearing from his mother, one of her sons went to the home he shared with her and found blood on the back patio while no one was home, FOX 32 Chicago reported, citing court documents.

Brown was later found about 100 to 150 feet from her own back door. She was 73.

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Jan 4, 2015; Indianapolis, IN, USA; Indianapolis Colts free safety Sergio Brown (38) against the Cincinnati Bengals during the 2014 AFC Wild Card playoff football game at Lucas Oil Stadium. (Andrew Weber-USA TODAY Sports)

Brown, 35, was taken into custody after trying to re-enter the United States into California from Mexico by the San Diego Police Department Threat Management Unit and several other local and federal agencies after a warrant for his arrest was issued in Illinois. 

The Cook County Medical Examiner’s Office ruled Brown's death a homicide, saying she was injured during an assault.

Brown was officially listed as missing in mid-September when his mother died. But, shortly afterward, he appeared to put out a video on an Instagram account named @intplayerwithapassport, even though he has a verified account on the platform already. In the video, the former defensive back called the death of his mother "fake news" and said "it has to be the FBI."

Sergio Brown #38 of the Indianapolis Colts seen on the sidelines during action against the Jacksonville Jaguars at Lucas Oil Stadium on September 23, 2012 in Indianapolis,