The Allegheny County District Attorney's Office will not pursue criminal charges against Elizabeth Derkosh, the mother of the late Maddox Derkosh, who was killed in a tragic mauling accident at the Pittsburgh Zoo in early November.

However, District Attorney Stephen A. Zappala Jr. is investigating a possible criminal negligence charge against the zoo, according to KDKA.

Elizabeth and 2-year-old Maddox, both of Whitehall Borough's Highgrove Road, were visiting the zoo on Nov. 4 when Maddox fell from the top of a platform railing to the ground inside of the pit area of an African painted dogs exhibit, according to a statement from the Pittsburgh Bureau of Police.

Pittsburgh police said that the child lost his balance after his mother lifted him in a standing position onto the 4-foot-high wooden railing that overlooks the enclosure. He fell into the pen and was mauled to death by the dogs.

KDKA reports that Zappala has specifically criticized zoo security, training and zoo officials' response to the accident.

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