. >> reporter: dave dooley, the janitor. >> dave dooley was with ed yuska when the body was found. >>eporter: doug tungate, a temp employee, and joe siegert, a warehouse worker. >> doug tungate and joe 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 -- the questions begin. where was michelle's husband dan the morning of the murder? >> i was sleeping. what a great alibi, right? >> why did you sleep on the couch and she sleep on the bed? it made us want to take a closer look at dan. not so long ago, on a street just around the corner... i'm home. hi dad the force was strong between father and son. you got it? what are you doing buddy? it's