The killer of four University of Idaho students likely entered through a sliding door and stalked through three bedrooms carrying out their knife rampage, records indicate.

Floor plans of the off-campus house where the slain students lived show two bedrooms on the third floor and two on the second, all accessible through a glass screen door.

Police said the stabbings of Ethan Chapin, 20, Xana Kernodle, 20, Madison Mogen, 21, and Kaylee Goncalves, 21, took place in the early hours of Nov. 13 while roommates Bethany Funke and Dylan Mortensen slept on the first floor.

The house plans of 1122 King Road obtained by the Daily Mail show provide a clearer layout of the split-level property in the city of Moscow.

Chapin and Kernodle, who were dating, are thought to have been sleeping together in a bedroom on one floor — while Mogen and Goncalves would have been in separate bedrooms on the other.

The house has a split-level layout, with a lower first floor accessed by a door with a code lock. The other two roommates — Bethany Funke and Dylan Martensen — unknowingly slept through the carnage on the lower level.

Here’s the latest coverage on the brutal killings of four college friends:

A TikTok video of Goncalves with her pet dog was shot in a room on the third floor with the balcony visible, indicating that was where she lived.

To confront the victims on the third floor, the suspect would have passed through multiple common rooms, including the living room, on the second level.

Police declined to say Wednesday if the suspect entered through the front door or the sliding door.

The 2,300 square feet home also has three bathrooms and was most recently rented in June for $2,498 per month.

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“One of the top campus housing options available! — Sought after location within close walking/biking/driving distance to campus and Greek Row,” the previous listing states.

Moscow police have ruled out several people as suspects, including the roommates and an ex-boyfriend of Goncalves. A man seen in security footage near the Mogen and Goncalves at a food truck on the night they died has also been ruled out, police said.

No murder weapon has been recovered. The FBI and state police are also part of the homicide probe.