Jury selection is set to begin in Illinois in the murder trial of a now-former deputy charged with killing 36-year-old Sonya Massey after she called 911 for help. Body camera videos will play a pivotal role, showing the moment then-Sangamon County Deputy Sean Grayson shot Massey, later saying in court motions that he feared for his life. NBC’s Maggie Vespa reports for TODAY. Warning: Some of the video is disturbing.

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