they sent it off for testing. as they waited for results, they drilled down on one more possible person of interest. the third man, the wasn't who just might have had a motive, pam okay ex-husband, curt zimmerman. look at him, said pam's family. there was something going on there. >> it definitely turned into hatred. >> a lot of problems. >> problems? hatred? exactly what was the problem between pam zimmerman and her ex-husband kirk? >> coming up, the ex, the clients, the fiancee, revelations about them all. >> who was it who said no secrets in a murder investigation? >> exactly. >> when "dateline" continues.

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