Sandra was last seen in South Bend, Indiana on March 11, 1987, four days before her seventeenth birthday. She and a friend went out together and became separated, and Sandra has never been heard from again. Her friend stated Sandra had a phone conversation with an unknown person the night before her disappearance, but the friend did not hear what the conversation was about. She did not take any of her belongings or money when she went missing. Sandra testified at a murder trial in 1986 as she had witnessed the shooting of one of her friends. A suspect was convicted in the killing and is still in prison. Sandra was threatened afterwards by an unidentified person, as were several of the other witnesses in the trial. She has a scar on the right side of her neck.