Choi declined to provide details about the incident.
She said, "The last thing we need is to fuel anger with more hate or violence, especially toward the many incredible police officers who risk their lives every single day to protect our families and communities".
After the police killings of two black men in Baton Rouge and Minnesota, the shootings of twelve officers in Dallas, and with tensions still high - protests continuing and reports of police clashes in a number of U.S. cities - what does it all mean for race relations in North America? Dayton said Friday that he stood by his statements and had no new information about the case.
It was the second fatal police shooting this week, coming only days after a black 37-year-old man, was killed by officers in Baton Rouge, Louisiana.
Taking to her website, she wrote: 'This week we watched Alton Sterling and Philando Castile, two innocent black men, get senselessly murdered by police officers. Parts of that shooting were also caught on video.
She also adds links to donate to the families of both Castile and Sterling. Baton Rouge police said they are investigating a newspaper website's video that appears to show an officer with his weapon temporarily drawn at one point early Saturday morning as protesters confronted police.
Yanez and an officer who was with him, Joseph Kauser, were put on administrative leave, as is standard, authorities said.
The woman live streamed the immediate aftermath of the shooting, showing Castile bleeding in the front seat with the officer's gun still drawn.
Castile's mother, Valerie Castile, reportedly told CNN, "I think he was just black in the wrong place".
"The other ones, I thought, you know, I could see why the cop took the shot", Schommer said. "He was just getting his license and registration, Sir".
Attorney Thomas Kelly said he is "rather restricted" until the Saint Antony Police Department, Officer's Yanez' employer, and the Minnesota Bureau of Crime Apprehension sign off on the investigation.
The bureau says Yanez approached the driver's side of the auto and Kauser approached from the passenger side before Yanez shot Castile multiple times. The agency said Yanez opened fire, striking Castile multiple times.
The agency said several videos, including squad vehicle video, have been collected, though St. Anthony officers don't wear body cameras. The officers' races were not immediately known.
Reynolds described the officer who shot Castile as Asian.
Mr Yanez reportedly believes he saw a weapon.
In St. Paul this weekend, protests forced the closure of Interstate 94. "[Yanez] didn't ask about it", she said.
She says that she made a decision to stream the encounter because she assumed that no one would believe her otherwise.
"This has to cease".