Charles Robert Wallace, who shot two sheriff's deputies last week, also confronted an 87-year-old woman in her home and then stole her car. She fought him with her cane, and he did hit her with the butt of his gun, but he didn't shoot here, though he'd shown no hesitation shooting the deputies (who both lived, thank God!)
Wallace ended up killing himself, so no one will be able to ask him why he spared Mary Rock's life. I'm wondering if she reminded him of a beloved grandmother or maybe deep inside him, before the heroin addiction and criminal life took bites out of his soul, he had some decency left, after all.
The mystery died with him.