The new charges appear to challenge Horner's alleged explanation to investigators for his killing of Athena Strand... Horner had told investigators the little girl was not seriously injured when he accidentally backed his truck into her, according to an arrest warrant affidavit. The suspect told investigators that he “panicked” and feared “she was going to tell her father about being hit by the FedEx truck the Defendant was operating,” leading him to strangle her, the affidavit said.

When he claimed this many speculated that he was desperately trying to avoid a child rape charge on top of murder. The article does not say if the autopsy was completed, but maybe the prosecutors have seen initial results.