McClain declined to comment Wednesday because of the active internal investigation.
Los Angeles Police Chief Charlie Beck said in a statement Wednesday that the coroner's report shows Hernandez could not have been saved. He criticized "irresponsible" media reports.
"What concerns me most about this is that it brought needless trauma to the grieving family members of Officer Hernandez," Beck said.
Ciancia, 23, was transferred from a hospital into U.S. Marshals custody Tuesday. He could face the death penalty if convicted of a federal murder charge.
Tami Abdollah can be reached at http://www.twitter.com/latams .