. >> reporter: a short list of potential suspects for prosecutor linda tally smith. >> i've referredthis 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. >> reporter: michelle mockbee's siblings remember her as the big sister who literally couldn't lose. >> she was the contest queen. she won every contest there was for like a two-year run. >> yeah. you name it. she won tvs. flat screen tvs. >> tickets to everything, gift cards, you know, everything. >> super bowl parties. >> lucky. >> she loved it. it made her so happy. and it made her even more happy to share her winnings with other people. >> reporter: but now it was michelle's family that had lo