Zackary was last seen in York, South Carolina on June 1, 1996. He was abducted by his non-custodial mother, Marisa Ann Kirsh. Marisa's photograph and vital statistics are posted below this case summary. A felony warrant for kidnapping was issued for her on August 12, 1996.

In 2004, Marisa was arrested in South Africa and charged with attempted smuggling of nuclear weapons. She allegedly helped to smuggle spark plugs in 2003 from the United States to South Africa, en route to Pakistan. The devices have medical uses, but they can also be used to detonate bombs. Authorities believe Marisa was working with Asher Karni, a South African businessman who had allegedly cut a deal with Humayun Khan, a Pakistani, who was supposed to receive the weapons components. Karni pleaded guilty to related charges and was sentenced to three years in prison. He has since returned to his native Israel. Khan remains free in Pakistan. Marisa is awaiting trial.

It's unclear whether Zackary was with his mother at the time of her arrest or whether his current whereabouts are known, but he remains listed as a missing child. His case remains unsolved.

Texas authorities are assisting with Zackary's investigation.