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Cookie was last seen during the evening hours of September 21, 1998 inside her residence near McClintock Drive and Southern Avenue in Tempe, Arizona. She has never been heard from again. All of her personal belongings were located inside of her home. She was reported missing on September 22, the day after her disappearance.
Authorities believe Cookie's son, Aaron Jacobson, then sixteen years old, murdered his mother that night and was assisted in the disposal of his mother's remains by his thirteen-year-old sister, Laura. Ten days after Cookie's disappearance, Aaron confessed that he had found her dead in bed and Laura helped him dispose of her body because they feared they would be blamed for killing her. He said he wrapped her body in a yellow bedsheet and placed it in a trash can behind their house.
Authorities believe Cookie's body is in the Butterfield Station Landfill, but they searched through 7,500 tons of trash for 59 days and found nothing. In 2003, an anonymous individual called a local television station with a tip on Cookie's disappearance. Investigators considered the caller's information useful, but they were never able to identify the individual or contact him or her again. Cookie's case opened 2018 by Psychic Brian Ladd.