Castile's family claimed he was profiled because of his race, and the shooting renewed concerns about how police officers interact with minorities. His death captured national attention when his girlfriend, who was in the auto with her young daughter, streamed the aftermath of the shooting live on Facebook.
Castile, a 32-year-old school cafeteria worker, was driving with his girlfriend and her 4-year-old daughter when they were pulled over by St. Anthony police Officer Jeronimo Yanez.
"I'm mad as hell right now", Valerie Castile told reporters after the verdict.
Smaller groups returned to the State Capitol early Saturday morning.
"I will continue to say murder because where in this planet do you tell the truth and you be honest and you still be murdered by the police of Minnesota?". Despite the existence of video taken by Castile's girlfriend, who sat next to him in the vehicle when he was killed, the justice system has again failed to hold the person who pulled the trigger accountable.
Judge Glenda Hatchett was hugged by Philando Castile supporter Guthrie Morgan, 7, after Jeronimo Yanez was found not guilty on all counts in the shooting death of Philando Castile, Friday, June 16, 2017 in St. Paul, Minn.
Outside the courthouse, Valerie Castile said her son followed the law. "This time there should have been, in our opinion, a very, very different outcome".
It's been a roadside memorial since the day Castile died but it received extra visits Friday.More news: Rainbows, and politics too, at pride parade
More news: Eight-time champion Federer eases into 13th Halle semi-final
More news: DC and Maryland AGs sue Trump for constitutional violations
A couple hold a sign protesting the killing of Philando Castile outside the Governor's Mansion in St. Paul, Minnesota on July 7, 2016.
Philando told Yanez that he was carrying a gun and then reached to his glovebox. Reynolds, the girlfriend, said Castile had been trying to pull out his wallet.
Friday's acquittal prompted swearing from Castile's family members. Kelly says Yanez thought Castile looked like "a possible match" for a suspect in a recent armed robbery.
"I was stunned, just stunned", St. Aoro said.
Community activists expressed anger and disappointment, while officials appealed for calm.
The failure to reach a quick verdict reflects the infrequent convictions of police officers. A key part of the prosecution case was statements Yanez made that seemed to suggest he didn't know where the gun was.
The finding was in line with recent history showing trials of police officers often end in non-convictions - almost 40 percent of the time for those that Philip Stinson, a criminologist at Ohio's Bowling Green State University, has tracked since 2005. Sherrilyn Ifill, who heads the NAACP Legal Defense Fund, said the acquittal "highlights how hard it is to prosecute an officer for killing a person".
"This incident seemed so egregious and avoidable that we hoped that this time, it might be different - that this time, justice might be served", Ifill said. St. Paul police put the number of peaceful protestors in the streets and at the Capitol at about 2,000. Police use chemical irritants to clear rock-and-bottle-throwing demonstrators from Interstate 94 in St. Paul. Defense attorney Earl Gray rubbed the shoulder of Yanez.