School shooter’s dad arrested for trying to ‘bond’ with killer daughter using sick method as chilling new details emerge

THE dad of a teenage school shooter has been arrested after his sad attempts at bonding with his daughter ended in carnage.

Natalie Rupnow, 15, fumed over her dad Jeffrey’s divorce in a disturbing note before she killed two and turned the gun on herself.

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Investigators are unraveling the truth behind the shooter’s tumultuous relationship with her father, and how she brought a stash of weapons into Abundant Life Christian School on December 16.

That day, the teen snuck a 9 mm Glock handgun and a .22-caliber Sig Sauer pistol with magazines and extra ammo into her bag and opened fire on a study hall in the Madison, Wisconsin, school.

She murdered teacher Erin Michelle West and classmate Rubi Bergara, 14, and hurt seven others before killing herself.

She donned a black T-shirt with a bullseye emblazoned on the front for the attack.

Jeffrey revealed that he had purchased both weapons for his daughter as presents because he thought that shooting was a way for the two to bond, Wisconsin prosecutors say.

Rupnow had spiraled into a mental health crisis since Jeffrey and her mom Melissa Rupnow separated, and struggled with self-harm and threats of suicide.

Jeffrey said that her cutting had gotten so severe that he had to lock up all of their knives.

Rupnow was in therapy to try to help her socialization skills. Her therapist said that the teen was suffering from post-traumatic stress disorder from the divorce, Melissa told detectives.

Jeffrey said that he took his daughter shooting about two years before she opened fire on the school, and she appeared to enjoy herself.

He saw the activity as a sick way to bond, but was shocked when her interest in guns “snowballed” out of control, he told cops.

Despite her obvious signs of struggling, Rupnow told his daughter that the password to his gun safe was the last four digits of his Social Security number backward.

He’s now been charged with two counts of intentionally giving a dangerous weapon to a person under 18, causing death, and contributing to the delinquency of a child.

HAUNTING SIGNS

When detectives searched Rupnow’s room, they uncovered a disturbing note titled War Against Humanity where she described humanity as “filth.”

At one point, she blasted people who “smoke their lungs out with weed or drink as much as they can like my father.”

The killer also revealed that she was able to secure the guns “by lies and manipulation, and my fathers stupidity.”

Cops discovered a handwritten schedule explaining how she planned to start her shooting at 11:30 am and kill everyone on the first and second floors of the school by 11:55 am.

They also found a cardboard model of the building and maps of the school.

Rupnow was active on social media, and had connected with people online over their admiration of school shooters.

After the horrific attack, Alexander Paffendorf, 20, was arrested at his family home in California for allegedly planning attacks on government buildings with Rupnow, according to court filings.

He’s now been hit with a three-year gun violence restraining order, which bars him from purchasing firearms.