Deborah Roberts

He's making multiple passes at the house.

We believe that Brian Koberger entered the house sometime shortly after his last scene on the video, somewhere probably around 4.10 a.m.

Police say Koberger entered through a sliding glass door in the back of the house.

Investigators believe Zanna was in her room with her boyfriend Ethan asleep in her bed, Dillon's across the hall, Bethany downstairs, and on the third floor, Kaylee and Maddie had fallen asleep together in Maddie's room.

Zanna was up.

We see activity from her watch of just steps that were taken.

We know that she's eating.

She's on social media at 412 and just shortly after that.

After entering the house, investigators believe Koberger walked through the kitchen and went upstairs to the third floor where he found Kaylee and Maddie together asleep.

Kaylee and Maddie were both killed very quickly, but they were stabbed repeatedly many times.

Stabbing is close, personal, long-term, violent action.

What investigators think happened is that Zanna heard the commotion.

At some point, Zanna comes, we believe, up the stairs.

Brian Koberger either hears something or he hears the stairs.

Something alerts him and takes him away from what he's doing in that bedroom.

Investigators say Zanna turned and ran and that Koberger followed, chasing her downstairs to her bedroom.

Zanna, after that initial contact in the doorway, she's fighting him.

We know that because she has defensive wounds all over herself.

She fought like hell.

And we think at that point, he realizes that there's a fourth person, and that's Ethan that's in the bed.