Led by expert prosecutor and former defense attorney Marcia Clark, A&Es new original docuseries Marcia Clark Investigates The First 48 delves into some of Americas most shocking crimes that have remained unsolved or ended with controversial outcomes. Clarks years of experience allow her to see the important details that original investigators may have missed and by looking at these cases through the lens of the critical first 48 hours, Clark will strive to discover the truth behind how and why these murders happened.