Blaming it on the Ouija board is just him shifting blame & not taking responsibility for his actions.
I would charge him as an adult with homicide and get him a psych. eval.
He should be charged as an adult, however, he was unsuccessful in his attempt. The best they can do is attempted homicide & assault.
I think the kid should go down for the crime, unless he sneezed when he was being told by the cardboard and plastic toy to kill his friend; then I think he should get a do over.
Unbelievable, yet it's all true.
Charge him with stupid and tell the defense to go phych plea.
If there were charges for stupid they'd need to build a lot more jails.