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>> thanks for coming up, bob. we appreciate it. >> reporter: once inside the cramped interview room, the investigators immediately changed the subject to bobs shaky alibi for the day of the murder. turns out, his roommate could not vouch for him or his timeline, as bob had said he would. >> i know its been a couple of weeks. but if you can remember. >> right now, i have a hard time tellin you what i did yesterday. its been so distraught. >> im sorry, but that is -- that is vague. >> im not tryin...

Didnt look at my -- at my phone and go, okay, its 2:00 and im watchin tv. i wasnt keepin track of time. >> reporter: he was selling. the cops werent buying. >> you understand this is a murder investigation? >> i absolutely understand, okay. >> so, anna was murdered. >> i -- yes. >> so when i get this, i mean its not like a baseball was stolen out of some store. >> right. >> everyone else is bendin over backwards to accommodate us and now were catchin "i dont know, i dont know, i dont keep track ...

Really happening in that marriage? >> right. if -- if youre suicidal, youre homicidal. that -- thats a real quick switch. >> reporter: that gave detective tschudy and ranger mankin a powerful reason to re-interview bob. but fearing hed lawyer up, they lured him back to the frisco pd, by saying they had information for him on annas estate. >> thanks for coming up, bob. we appreciate it. >> reporter: once inside the cramped interview room, the investigators immediately changed the subject to bobs ...