A former prosecutor in the Cook County State's Attorney's office says it took far too long to investigate the shooting death of Chicago teen Laquan McDonald at the hands of a white police officer. That prosecutor happens to be running for U.S. Senate.

Chicago Police Superintendent Garry McCarthy has been fired after widespread criticism for his handling of a high-profile shooting of a black teenager that led to white officer being charged with first degree murder.  Protesters have been calling for McCarthy's dismissal.

Laquan McDonald was shot 16 times after allegedly refusing to follow officers' instructions as he walked down a street with a knife in October 2014. The officer who shot him was charged Tuesday with murder.