Overview: Headlines for October 21, 2016; Chicago Cops Who Broke 'Code of Silence' to Report Police Drug Gang Face Deadly Retaliation; New York Mayor Apologizes for Police Killing of Mentally Ill Woman, But Will Accountability Follow; Shaun King on Colin Kaepernick: He is Enormously Courageous and Has Sparked a Movement Among Athletes; Former Bernie Sanders Supporter Shaun King Now Backs Hillary Clinton, Says She Has 'Evolved'; Shaun King: Black Lives Matter is Not a Carbon Copy of Black Panther Party, Our Time is Different