He jumped onto the back of the limousine while at the same time Mrs. Kennedy returned to her seat .
He clung to the car as it exited Dealey Plaza and accelerated , speeding to Parkland Memorial Hospital .
He jumped onto the back of the limousine while at the same time Mrs. Kennedy returned to her seat , and he clung to the car as it exited Dealey Plaza and accelerated , speeding to Parkland Memorial Hospital .