As the investigation continues, details are emerging about Castile's past encounters with police. Since 2002, law enforcement in Minnesota had pulled over the school cafeteria supervisor at least 52 times, according to state court records. He was charged with a number of offenses, including driving without proof of insurance, but many of the cases against him were dismissed.
Castile was pulled over an average of more than three times a year -- something that protesters argue is a sign of racial profiling.
One profiling expert told CNN he agreed.
"I would say that, looking at the record, it's consistent with a pattern of being racially profiled," says Myron Orfield, a professor of civil rights and civil liberties law at the University of Minnesota.
"He's got an awful lot of stops," Orfield says. "It suggests a pattern of very excessive policing."
An attorney for the officer who shot Castile says the shooting had nothing to do with race and everything to do with a gun being present at the scene.