>> chad was murdered. >> sergeant silbernagel did develop really good rapport with nikki entzel. now, nikki, but, that's what i want to find out. why would that happen to chad? >> i don't know. >> in the interview nikki repeats a lot that she doesn't know what happened. >> we went through that basic main story again, and i heard a lot of the same repeats. the excessive amount of drinking, the abuse. how much was he drinking? >> a case of crown and a case of proper 12 a month. >> oh, my gosh. >> all this alcohol usage, that chad was abusive and a heavy drinker, all the investigation never showed any of that. >> at times, nikki is very quiet in this interview. she's speaking almost in a whisper. you can hardly decipher what she's saying. >> i need to know why chad was murdered. >> i don't know. i just want him back. i just want him back! >> investigators are really curious about this man nikki is spending so much time with. >> they keep showing up on security cameras together -- at a jewelry store, walmart, a hotel, and at chad and nikki's house. nikki tells them his name is earl ho