Police say the parents felt the suspect should not own weapons, but did not realise guns were in the house.
Three adult school employees also died: Cynthia Peak, 61, Katherine Koonce, 60, and Mike Hill, 61.
The attack took place after the killer conducted surveillance of the premises, drew maps and wrote what police described as a "manifesto".They believed the suspect "should not own weapons", and were unaware the suspect "had been hiding several weapons within the house", said Nashville Police Chief John Drake on Tuesday.The killer "was under care - doctor's care - for an emotional disorder", Chief Drake said, without providing further details.
The suspect drove to the school in a Honda Fit and got into the building by firing through one of the doors, which were all locked.
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