...a knife inscribed with her chosen name of Aiden and an anklet with the number 508407 etched on it, an autopsy report revealed.
[...]
The autopsy revealed Hale's clothing was covered in 'handwritten words, drawings and numbers'. It's unclear what was written on her clothes.
The report also noted that Hale, 28, wore an orange plastic anklet with the mysterious inscription '508407.'
[...]
The toxicological analysis found no detection of drugs or alcohol.
[...]
The transgender artist had a detailed map of the building and conducted surveillance outside The Covenant School she once attended, before carrying out the devastating massacre.