>> yeah, we had to eliminate mike bordeaux. >> mike insisted he was in florida when kelli went missingo, 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. ♪ ♪ before you go there, or fist bump there, or... oh! i can't wait to go there! or reunite there, start here. walgreens makes it easy to stay protected wherever you go. schedule your free flu shot and covid-19 vaccine today. in business, setbacks change everything. so get comcast. business internet and add securityedge. it helps keep your network safe by scanning for threats every 10 minutes. and un