An Orange County mom is now facing a manslaughter charge after her teenage son allegedly struck and killed an 81-year-old Vietnam veteran while illegally riding an electric motorcycle. Prosecutors upgraded the case from multiple misdemeanor charges and two felony charges against 50-year-old Tommi Jo Mejer of Aliso Viejo following the death of Ed Ashman, a substitute teacher who was critically injured in the crash last month and died Friday, according to the Orange County District Attorney’s Office . Ashman — a retired US Marine Corps captain who flew combat missions in Vietman — was hit April 16 while walking home from El Toro High School in Lake Forest, where he worked, officials said. Prosecutors upgraded the case from multiple misdemeanor charges and two felony charges against 50-year-old Tommi Jo Mejer of Aliso Viejo (pictured) following the death of Ed Ashman. ABC7 Vietnam veteran Ed Ashman in a flight suit next to an Air Force plane in an undated photo.…