Police say a man was fatally stabbed and his sister was assaulted in a dispute with another man in an alley in Tucson. The Tucson Police Department says officers responding to a report of an injured person found 33-year-old Gary Lavier at an intersection early Friday as he was bleeding heavily from stab wounds. Lavier's sister also was bleeding from a head injury. Police say the suspect fled the scene. Police and firefighters provided aid to Lavier, but he later died at a hospital. The attack took place in an alley, but officers spotted Lavier at the nearby intersection. The injuries suffered by Lavier's sister weren't believed to be life-threatening.