Wrongfully arrested for murder, what now?

We all know there are a number of people probably now in prison who were charged with a crime they didn't commit. We've heard the stories of people being freed 20 years after they've spent time in prison for murder. Sad stories. Lets pretend you are convicted of a murder you didn't commit. However, the evidence is stacked against you even though you are the wrong person. So the evidence is stacked against the perpetrator but you are the person who was at the wrong place at the wrong crime. Since nobody believes you and only believes what the evidence shows, and you're about to have your life freedoms and rights stolen from you, how do you handle that? Going to spend life in prison for a crime you know you never committed?