walter scott shooting
The jury deliberated over four days.
Fleeing a traffic stop, Scott was shot by the officer and the incident captured on video.
He decided to change sides after a 20-minute conversation with the Vermont senator.
Slager will stand trial in October for killing the unarmed black motorist in South Carolina.
WHAT'S HAPPENING
The Southern States Police Benevolent Association informed Mark Slager four days after the shooting it wouldn't represent him.
Slager has been jailed since April.
Solicitor Scarlett Wilson did "not have time" to explain her record.
Slager was indicted on a murder charge in June.
Michael Slager, the South Carolina police officer caught on video shooting an unarmed black man who was running away after a traffic stop, is reportedly heard in new audio laughing about his "pumping" adrenaline immediately after the incident.