Ryan Snow, the bipolar man who slit his grandfather's throat and left him to die while he sipped wine at a neighborhood restaurant, was found guilty of first-degree murder Thursday. Spokane County Superior Court Judge Gregory D. Sypolt, who conducted a bench trial, said Snow's public defender failed to prove that Snow, 24, couldn't tell the difference between right and wrong, which is required in an insanity defense, when he killed James Bittick on July 29, 2006.