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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 bob's 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 it's been a couple of weeks. but if you can remember. >> right now, i have a hard time tellin' you what i did yesterday. it's been so distraught. >> i'm sorry, but that is -- that is vague. >> i'm not tryin' to be vague, it's just i don't have details for you because there's no details. sittin' ther...

Didn't look at my -- at my phone and go, okay, it's 2:00 and i'm watchin' tv. i wasn't keepin' track of time. >> reporter: he was selling. the cops weren't 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 it's not like a baseball was stolen out of some store. >> right. >> everyone else is bendin' over backwards to accommodate us and now we're catchin' "i don't know, i don't know, i don't keep track of every minute of every day." >> i don't. i can't tell you where -- where i was at 2:...

Really happening in that marriage? >> right. if -- if you're suicidal, you're homicidal. that -- that's a real quick switch. >> reporter: that gave detective tschudy and ranger mankin a powerful reason to re-interview bob. but fearing he'd lawyer up, they lured him back to the frisco pd, by saying they had information for him on anna's estate. >> thanks for coming up, bob. we appreciate it. >> reporter: once inside the cramped interview room, the investigators immediately changed the subject to bob's shaky alibi for the day of the murder. turns out, his roommate could not vouch for him or his ...