[Persevero]

But why would you put duct tape on a dead child’s mouth?

You’d put it on her while she was still alive. To keep her quiet.

After she is dead is serves no purpose.

So I think she was duct taped prior to dying.

[Joe 6-pack]

"But why would you put duct tape on a dead child’s mouth?...After she is dead is serves no purpose."

Not really. While I'm not suggesting this is my theory, if the death was the result of negligence on Casey's part, she may have wished to stage it to look like an abduction and murder...ergo, the post-mortem use of duct tape.

[PieterCasparzen]

But why would you put duct tape on a dead child’s mouth?

You’d put it on her while she was still alive. To keep her quiet.

After she is dead is serves no purpose.

So I think she was duct taped prior to dying.

Perhaps you have you never heard of corpse desecration...