As the USA dissects its recent mass shootings and tries to understand the killers' motivations in an effort to prevent the next one, at least one factor is "missing from the national conversation", California Gov. Gavin Newsom said. The 24-year-old Betts opened fire in a popular entertainment district, killing his sister and eight others.
Multiple officers shot and killed Betts at the scene.
The Justice Department says a friend of Betts is being charged with lying on federal firearms forms.
The charge comes just over a week after the mass shooting in Dayton, Ohio, where Betts opened fire in a popular entertainment district, killing his sister and eight others. The name of Betts' friend has not been released. Making a false statement regarding firearms carries a potential maximum sentence of up to five years' imprisonment.
"There is no evidence and no allegation. that Kollie intentionally participated in the planning" of the August 4 shooting, he said.
A message seeking comment was left with Kollie's attorney.
Investigators say there is no indication that a man who bought and stored body armor for the Dayton gunman knew that his friend was planning a mass shooting.
Kollie also purchased the body armor, the upper receiver for an AR-15 and the 100-round double drum magazine that Betts used during the shooting, Glassman said. Dozens more people were hurt by gunfire or injured while trying to escape.
Just days after the shooting, Ohio Republican Gov. Mike DeWine announced a package of gun control measures, including requiring background checks for almost all gun sales in Ohio and allowing courts to restrict firearms access for people perceived as threats.