VICTORVILLE, Calif. -- A 20-year-old mother was allegedly murdered by her neighbor following a dispute over a parking space in Victorville, California Tuesday, family members said.Sofia Adams was found dead in the 15500 block of Hesperia Road at about 2:06 p.m., according to the San Bernardino County Sheriff's Department."I ran in the house and I called the cops and they said that somebody had just called in somebody getting shot in the back of the head," neighbor Stacy Ash said.Relatives say Adams was planning to move out of the apartment she lived in with her 3-year-old son, because of an ongoing argument with another tenant over a parking spot.Neighbors say the other tenant, who didn't get along with Adams, was talking to sheriff's deputies at the scene. No arrests were immediately made.The victim graduated from high school just days ago and was focused on her future, family members said."Poor girl. All she wanted was to be a good mom," her cousin Valerie said.