Old movie woman is awaiting execution
I am looking for the title of a movie I saw when I was a kid. In the late 60s or early 70s. It begins with a man being shot by a woman in a hallway of a building. She runs a way and another woman I believe gets off the elevator and runs over, picks up the gun and is saying I'm sorry. She is arrested and is on death row to be executed but electrocution. I believe it is stayed once or twice but I think she is finally executed in the ends moments before the other woman arrives abnd confesses. It was a black and white picture.