An 39-year-old Barnesville woman has been arrested and charged with first degree vehicular homicide and hit and run in connection with the death here Saturday night of Gordon State College student Alexandra Noelle Desir.Desir, 20, was walking to her job at Huddle House from her dorm at Gordon when she was struck from behind and left to die on the sidewalk.Bobbie Jo Sumner was arrested at 8:15 Tuesday. After an interview, Sumner’s ex-boyfriend, Robert King of 2175 Old Atlanta Rd., Griffin, was also arrested. The Saturn Vue sought in connection with the hit and run was found at King’s home and processed by the GBI.UPDATE: Sumner was charged with vehicular homicide, leaving the scene of an accident, making false statements and tampering with evidence. King was charged with hindering the apprehension of a criminal, tampering with evidence, making false statements and obstruction of an officer.Sumner had a previous arrest in October, 2011 for ‘miscellaneous offenses’, according to her booking folio but ended up just being a witness in a filed complaint. Prior to her arrest, she was employed at the Marathon station located at the corner of Veterans Pkwy. and College Drive in Barnesville.The Barnesville Police Department extended a statement of appreciation to all the agencies who assisted in the investigation.Sheriff Brad White called the arrest a combined effort of the BPD, Lamar S.O., Spalding S.O. and the Georgia State Patrol.