UPDATE: Missing head belonging to Elvia Lopez-Arroyo, 64, found on bank of Santa Rosa Creek near Prince Memorial Greenway & A St, per @SantaRosaPolice. Her grandson, convicted felon Luis Gustavo Aroyo-Lopez, 23, was arrested by @SFPD at @TransitCenterSF pic.twitter.com/lI4SNWj8Le — Henry K...