held against her will. >> if this was a kidnapping, he knew they had to tread lightly with any possible suspects, like the couple she had met at the house. if they were involved, the last thing he wanted to do was tipped them off, and the detective says, there was someone else he had his eye on. >> coming up. >> they were asking questions, like you're the husband, and you just completely contaminated our crime scene. why did you do that. >> i knew that i was a suspect. >> when dateline continues. n dateline continues n dateline continues ♪ ♪ ♪ hey google, turn up the heat. ♪ ♪ ♪