COLUMBIA, S.C. - In the video, an unarmed black man runs away as a white police officer shoots him repeatedly in the back.

But a lone holdout on a South Carolina jury forced a mistrial.

The outcome stung many African-Americans and others. If that kind of evidence can't produce a conviction, they asked, what can?

Johnetta Elzie is a black activist who protested in Ferguson, Missouri. She is frustrated that the jury couldn't decide if it's illegal to shoot someone who is running away.

Prosecutors plan to retry former officer Michael Slager, who still faces a federal trial. North Charleston city officials approved a $6.5 million civil settlement for Walter Scott's family earlier this year.