SANTA ANA, Calif.—A man was charged Tuesday with murder in a Southern California road rage shooting that killed a 6-year-old boy on a local freeway last month, stunning the region and attracting national attention. Prosecutors in Orange County, California, charged Marcus Anthony Eriz, 24, with murder in the death of Aiden Leos, shooting at an occupied vehicle and with sentencing enhancements. Eriz’s girlfriend, Wynne Lee, was charged with being an accessory after the fact and illegally carrying a concealed firearm. Authorities said they believe Lee was driving the car and that Eriz fired the shot that killed Leos while his mother was driving the boy to kindergarten on May 21 in Orange County, southeast of Los Angeles. “With respect to the charges against both, I absolutely am convinced they’re rock solid,” Orange County District Attorney Todd Spitzer told reporters. The couple was expected to appear in court Tuesday afternoon. It …