. >> reporter: doug tungate, a temp employee, and joe siegert, a warehouse worker. >> doug tungate andoe siegert were the two that saw michelle when she came in. >> reporter: and dan mockbee -- >> of course, dan mockbee, because he's the husband. >> reporter: a short list of potential suspects for prosecutor linda tally smith. >> i've referred to this case as almost being like the game of clue. because you have a very small group. and it's a matter of accounting backwards and excluding people. >> reporter: so that's what faced investigators. in which room? with what weapon? and finally who? coming up -- detectives start with michelle's husband, dan. where was he the morning of the murder? >> i was sleeping. what a great alibi, right? >> i said, well, why'd you sleep on the couch and she sleep in the bed? it made us want to take a closer look at dan. >> when "dateline" continues. oh, look... another anti-wrinkle cream in no hurry to make anything happen. neutrogena® rapid wrinkle repair works in just one week. with the fastest retinol formula to visibly reduce wrinkles. neutrogena®. so