Katie Puwalowski died Tuesday afternoon at UPMC Mercy hospital where she was taken after the accident Monday night on what's known locally as the Parkway West.
That's where police say a tire fell off another vehicle traveling in the opposite direction, bounced over a concrete barrier, and hit the roof of Puwalowski's car, which was traveling in the other direction.
State police are still investigating, but say her passenger was able to safely steer the car off the highway. Puwalowski's passenger was treated and released from a hospital, and the driver of the Jeep Grand Cherokee which lost the tire wasn't hurt.
