Peter Van Sant and 48 HOURS investigate Marsha's disappearance and the murder case against her husband in "Missing Marsha". It's a case 48 HOURS has been working on for five years, and it raises questions about the challenges prosecutors often face when someone vanishes without a trace. It also includes a stunning ending that nobody - including prosecutors - saw coming.

Two witnesses who watched as a woman was gunned down in her Florida home by a mysterious clown speak out for the first time on network television.