SANTA ANA, Calif.—A Southern California couple could face a murder charge over a road rage shooting that killed a six-year-old boy last month on a freeway, authorities said. Marcus Anthony Eriz, 24, and Wynne Lee, 23, were expected to be arraigned Tuesday in the death of Aiden Leos, who was shot as his mother drove him to kindergarten on May 21 in Orange County, southeast of Los Angeles. According to accounts from the mother and witnesses who stopped to help her, another car cut her off and she responded with a hand gesture and the car slipped in behind her and someone inside fired a shot through the rear of her car. California Highway Patrol officials have said that the road rage violence stemmed from “a perceived unsafe lane change.” Highway patrol Capt. Mike Harris said Monday that he spoke to Aiden’s mother about the arrests. “I FaceTimed her,” he …