Marcia Clark was the lead prosecutor in what has been called the "trial of the century" -- the O.J. Simpson trial
Simpson was ultimately acquitted of the 1994 murders of his ex-wife Nicole Brown Simpson, and her friend Ron Goldman.
After the trial, Marcia launched a new career as a writer. Her new novel is called "Blood Defense" and it's about the hard-changing criminal defense attorney in Los Angeles.
Marcia Clark joined WGN Morning News today.
Watch our interview with her in the video player above