A drug ambush went bad, and a Texas Ranger was brought down in the line of duty. Now, more than a quarter of a century after the shooting, the man convicted of the crime speaks on national television for the first time. Greg Ott's tortured journey through the justice system poses two questions: Is he guilty, and if so, what is fair punishment for killing an officer of the law?

SEGMENT ONE: The Crime On Tuesday, October 19, 1994, Susan Smith, the 23-year-old mother of 3-year-old Michael, and his 14-month-old brother Alex strapped her children into the back of her 1990 maroon Mazda and drove the roads of Union County, South Carolina for almost two hours.

In Hastings, January 1999, every parent’s greatest fear came true. Two little girls, Charlene Lunnon and Lisa Hoodless, went missing as they walked to school. Like Madeleine McCann, their disappearance dominated the headlines. Over four days the country watched as a huge Police hunt became increasingly desperate. They had been snatched by 46-year-old Alan Hopkinson, a predatory paedophile with a history of kidnapping young girls. He had bundled them into the boot of his car and no one had witnessed their abduction.