welcome back. here once again is dennis murphy with "consumed." >> six days after the cold-blooded murder of julie griffith, family and friends gathered at her church to say good-bye. between the visitation and the memorial service, son zach was overwhelmed. >> just showed, like, what an amazing woman that my mom was to have that many people come out just to say that, you know, they just wanted to give their condolences. >> to close friends craig and temple bradley, julie's husband keith was more emotional that day than they'd ever seen him. >> tears, sadness. >> i'd never seen him cry, you know, in my life. >> but even as the griffith family mourned, zach and his brother were feeling uneasy about the investigation which seemed to be focused exclusively on their father. >> i was angry. i felt that the detectives, the sheriff's department were on a manhunt, and they were after my dad. >> because the husbands always do it? >> yep, the husbands always do it. and they just seemed they zeroed in on him and were going at it 110 miles an hour. and were not respectful to my brother and i about any of the developments or anything going on. >> but detective matt carter had an ongoing investigation, and he felt there was ample reason to pursue their dad. after his interview with deanna, he had driven to the hotel that was keith's alibi. there he uncovered a bombshell. remember keith saying to the detective he had been at the hotel the entire night, ducking out just twice to get a drink and a snack? well, unhappily for keith's alibi, when the detective hit play on the hotel security video, it told a vastly different story. keith is seen leaving as he claimed around 11:00 p.m. but -- >> i think within 15 to 30 minutes he's going to be returning. that never happened. >> you're scrolling through the tape. >> going through, going through. >> and then when did your bingo moment come up? >> he finally arrived back at the hotel six hours and 34 minutes after he left initially.