Seattle gunman Kyle Huff spray-painted "now" on sidewalks as he approached the house where he would shortly massacre six innocent people. That has got to be credible evidence of command hallucinations.
My heart goes out to the victims and their loved ones.
As for Mr. Huff...
Let the day perish wherein I was born, and the night in which it was said, There is a man child conceived.Job 3:3