Tyree King was pronounced dead 40 minutes after officers were sent to the scene of a reported armed robbery. Police say he had a BB pistol that resembled a handgun with a laser site.
A 23-year-old black man was shot and killed as he fled a traffic stop on Saturday; police say he was armed. Protests on Sunday night were smaller and less destructive than on Saturday night.
Baltimore County police shot and killed Korryn Gaines, 23, on Monday after an hours-long standoff; her 5-year-old son was wounded. Police say Gaines was posting video of the standoff on social media.
Ramsey County Attorney John Choi says he won't step aside but will incorporate a "special prosecutor" into his team. Castile was shot and killed by a police officer during a traffic stop July 6.
Speaking to the NAACP annual convention, Clinton spoke of bringing "the full weight of the law" against those who kill officers and confronting racial bias.
Montrell Jackson, one of three officers killed Sunday, had written about the tensions he felt, saying on Facebook, "Please don't let hate infect your heart." His brother says Jackson loved his job.
Sterling was shot by police on Tuesday, and videos of the shooting prompted protests and outcry. Media reports say the white officers who shot him had been cleared of former use-of-force complaints.
The killing of Philando Castile, 32, in suburban St. Paul, Minn., is the second police shooting of an African-American man to gain national attention this week.