Quote:A white former South Carolina officer was sentenced to 20 years in prison on Thursday for fatally shooting an unarmed black motorist in the back in 2015, wrapping up a case that became a rallying cry for the Black Lives Matter movement.

Attorneys for ex-North Charleston Officer Michael Slager said he shot 50-year-old Walter Scott in self-defense after the two fought and Scott reached for Slager's stun gun. They said race didn't play any role in the shooting and that Slager never had any "racial animus" toward minorities.

Still, Slager pleaded guilty in federal court to violating Scott's civil rights. As part of the plea agreement reached in May, prosecutors dropped state murder charges. A year ago, a state judge declared a mistrial when jurors deadlocked.

Quote:A pre-sentencing report for Slager found that he committed manslaughter and recommended 10 to nearly 13 years in prison. But the judge was not bound by that decision.

If Slager had faced another state trial and been convicted of murder, he could have been sentenced to anywhere from 30 years to life in prison.

Convictions in police officer shootings are uncommon in the U.S. and prison time is even rarer.

South Carolina has been aggressive in charging white officers who shoot unarmed black people. Four have pleaded guilty in state or federal court in the past six years. But only Slager and former state trooper Sean Groubert, who shot a man as he tried to get his wallet during a seat belt violation check, will have been sent to prison. Groubert was sentenced to five years behind bars.