went back to pick up something. Santana thinks it was the Taser but said he was n't 100 % sure what it was. Neither the struggle nor the use of a Taser was captured on video, because Santana had yet to begin recording. What we know about Officer Slager The cell phone video, which Santana revealed this week, reignited national outcries surrounding police treatment of African-Americans and led to a murder charge against Slager, who is white. Scott was black. Police said Slager pulled the 50-year-old Scott over for a nonworking brake light on Saturday morning. Scott, according to a dash cam video, fled from Slager for unexplained reasons, and the officer chased him on foot. When Santana's video begins, Scott starts running away from the officer, with Scott's back to Slager. The video shows Slager shooting at Scott eight times before Scott falls down. Who was Walter Scott ? Scott's mother, Judy Scott, told Cooper this week that she would want to thank Santana for coming forward. He was there. God planned that. He's the ram in the bush -- I truly believe that, Judy Scott said. Santana agreed. I think she was right, he said. God put me there for a reason. Judy Scott said she could n't watch the whole recording. When I saw my son running and I saw the policeman behind him, I could n't take it, she said. I had to turn away. I could n't handle it. In an interview with NBC's Matt