The county medical examiner determined that the boy survived the fall but bled to death from the attack, which zoo officials said staff members couldn't stop because it happened so quickly.
In addition to an internal zoo review, the death is being investigated by the U.S. Department of Agriculture and the Association of Zoos and Aquariums, an accrediting organization. Neither is expected to announce findings soon.
It appears to be an accident that won't result in criminal charges, said Mike Manko, a spokesman for the Allegheny County district attorney's office, which is waiting for other information before closing the case. The district attorney also expects the observation platform above the exhibit to be improved, Manko said.
Toy trucks can be donated directly to the funeral home.
William Slater II Funeral Service: http://bitly.com/SzCnbx