A movie about two lawyers that try to prove a man's innocence

I saw this movie when I was younger, so just bare with me please? I only remember bits and pieces of it.
It's about a younger, blonde hair lawyer and a bigger, older lawyer trying to prove a man's innocence. He is on trial for murder, killing a woman. When their questioning the town, one of the witnesses gets threatening phone calls that she had better not say anything to the police or to the lawyers about what she saw the night of the murder, which at the end of the movie she goes forward. Theres another witness. He is an african american. The night of the murder he was drunk and his shoulder brushed up against a guy in dark clothing carrying a bag. Also, the man that is on trial looks exactly like the man that the african american seen walking home. And he also comes forward. The guy in the dark clothing turns out to work at a nearby supermarket. The woman that got killed, her husband is in the service as well if that helps. Once again i'm sorry that I couldn't remember everything, but just bits and pieces.