This is Hidden Killers Live with Tony Bruske, Stacey Cole, and Todd Michaels.

By the time, Romy Reiner walked into her parents' Brentwood home on that Sunday afternoon

and found them dead in the master bedroom.

Her brother, Nick, had been gone for hours.

The murders allegedly happened early that morning. Nick

reportedly checked into a hotel in Santa Monica, then somehow ended up walking the streets near

USC, where he was arrested without incident around 9.15 p.m. caught on camera at a gas station

buying a bottled drink like it was any other night. The murder weapon has not yet been

recovered, but according to law enforcement, they have enough. So how did investigators piece this

together so fast? And what does the evidence really tell us? Jennifer Coffendaffer, retired FBI

special agent with us to help us break this down and get a better understanding of the investigative end of this

in our first part of the conversation here, Jen, Romney discovered her parents' bodies in the

master bedroom around 3.30 on Sunday afternoon, allegedly, but the murders allegedly

occurred far earlier that morning. When investigators arrived

who was seen where the victims have been dead for almost half a day here, probably roughly

12 hours, give or take a little bit. What is the immediate priority at that moment in time for a scene

like this? Well, the immediate priority is safety. They're going to want to make sure that whoever did that isn't anywhere in and around that

area.

So they're going to be able to go in and do sort of a scene safety type clear.

But remember, the biggest clue that they had when they hit the scene was Romi saying

purportedly that Nick did

goodness. And so that was the first clue and kind of pointer as to what direction this investigation

...