Eyewitness (1956)

When she has a fight, with her husband, Lucy runs out of the house, and into a night of terror. She heads for the local cinema, and in doing so, becomes the only eyewitness to a couple of crooks, who are robbing the cinema's safe. In her haste to escape the thieves, she is knocked down by a passing bus, and is taken to the local hospital. The two crooks follow, and wait for a chance to finish her off, and thus eliminate the only person who can tie them to the robbery.