A Knoxville man shot and killed a Pittsburgh police dog Tuesday before the canine's handler returned fire, killing the man in what city police Chief Nate Harper called "an unfortunate" but justifiable action. The shooting outraged and angered the family of the 19-year-old man, Justin Jackson. He was pronounced dead by a passing paramedic almost immediately after the shooting that occurred at 6:53 p.m. in front of the UPMC facility on Arlington Avenue on the border of Knoxville and Mt. Oliver. Harper said the dog's handler ordered the canine -- a 6-year-old German shepherd named Aulf -- to attack after...