The bystander who took video of a South Carolina police officer shooting a black man in the back multiple times was interviewed by NBC's Lester Holt Wednesday, revealing details of his decision to record the incident and how he handed the video over to the family. (Scroll down to watch the video.)

The day after the shooting, Feidin Santana said he approached the victim’s brother, who was standing in the spot where Walter Scott had been gunned down.

"I have something to share with you," Santana told Walter's brother, Anthony, according to the Los Angeles Times.

Santana said he then showed Anthony Scott a Samsung cellphone and played the video that within days resulted in murder charges against North Charleston, S.C., officer Michael Slager.

The Scott family attorney said Santana was afraid to come forward at first, for fear of retribution.

Santana said he started recording after he heard the Taser gun.

"I remember the police had control of the situation," Santana told NBC’s Lester Holt. "He had control of Scott. And Scott was trying just to get away from the Taser."

"As you can see in the video, the police officer just shot him in the back," Santana said. "I knew right away, I had something on my hands."

The Scott family's lawyer, L. Chris Stewart, called Santana a "hero" at a news conference held by the family Tuesday night.

North Charleston Mayor Keith Summey said  he had already ordered 101 body cameras to be worn by the city's police officers before the incident, and now he plans to order another 150.