He told CBS News that Hale, a 28-year-old from Nashville, may have been considering targeting family members and a local mall as well.
He said during a search of Hale’s home, police had found “more maps pertaining to maybe some thinking about some other incidents”.
The police chief said other evidence found at the house – including a manifesto and a “booklet” – indicated the shooting was highly planned.
“We have maps that show the entry point into the school, the weapons that were going to be used, the clothing that she was gonna wear, and she had drawn it up, almost like a cartoon character. It was exactly what she had on during this incident,” Drake told CBS.