death sentence case, both pleaded not guilty. john sutton got busy. he had a mission, two, in fact, one, to seek justice, no matter what that might mean for his son. the other, perhaps even more impossible, to simply see again. coming up, garrett kopp's confession should be enough to put him behind bars, but did prosecutors have enough to convict christopher sutton? >> this was a circumstanceal case, extremely circumstantial. >> when "dateline" continues. he does it all with dr. scholl's. only dr. scholl's has massaging gel insoles that provide all-day comfort. to keep him feeling more energized. dr. scholl's. born to move. happiness is powerful flea and tick protection from nexgard. nexgard kills fleas and ticks all month long. and it comes in an easy-to-give tasty chew.