>> yeah, we had to eliminate mike bordeaux. >> mike insisted he was in florida when kelli went missingfayetteville. even so, police still considered him the primary person of interest. >> has her husband been questioned by detectives? >> we've had conversation with mr. bordeaux. >> police also needed to have a conversation with kelli'ds boyfriend, justin thompson. little did they know that justin had a huge new lead waiting for them about the night kelli disappeared. coming up -- a new possible suspect. >> he is the last person that is seen with kelli. that was very concerning to us. >> why something in his past would trigger even more alarm bells. >> it certainly was a red flag. >> when "dateline" continues. need a backup plan? get plan b one-step. plan b helps prevent pregnancy before it starts by temporarily delaying ovulation—and you can resume your regular birth control right away. i've got this. ♪♪ this fall, xfinity rewards is thanking you i've got this. with spooky perks and surprises. enter for your chance to win a trip to universal's halloween horror nights for a terrifyingly