Deranged Minneapolis gunman Robin Westman blamed his mother for his decision to kill “so many people” at a Catholic school after she warned him that he would regret transitioning to female — while in the next line in his manifesto, he discouraged people from letting their kids change gender.

In his disturbed manifesto, Westman, 23, claimed to be anxious about a visit from his mother in an entry dated July 1, where he recalled her concerns about him transitioning.

“Your words, mother, made me stay in my discomfort unable to ask for help to avoid admitting defeat. You were right mama, but the way you handled it led me to wanting to kill so so many people,” he wrote.

In his manifesto, deranged Minneapolis Catholic school gunman Robin Westman, 23, claimed to be anxious about a visit from his mother in an entry dated July, where he recalled her warnings about transitioning. Facebook / Mary Grace Westman

In the rambling writings, the crazed gunman also appeared to blame transitioning and smoking marijuana for his violence.

“Gender and weed fucked up my head,” he claimed. “I wish I never tried experimenting with either. Don’t let your kids smoke weed or change gender until they are like seventeen.”

Much of the manifesto is written in a homespun code that uses Cyrillic characters and English phonetic words, which have been translated by The Post.

Here’s what we know about the Catholic school shooting in Minneapolis

The July 1 entry included second thoughts Westman was having regarding his gender and worries about what would change during the meeting with his mother, Mary Grace Westman.

Law enforcement officers work at the scene of a shooting at Annunciation Catholic School in Minneapolis, Minnesota, on August 27, 2025. AFP via Getty Images

“When I was first out to my mother, she was VERY antagonistic. She really made me hate myself and think I will never be good enough,” Westman wrote.

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“I remember one day, she said something like, ‘In the future you will look back and feel ridiculous about who you feel like you are inside. You will regret this.’ 

“Well guess what mom?! I regret being born,” the gunman added. 

“When I was first out to my mother, she was VERY antagonistic. She really made me hate myself and think I will never be good enough,” Westman wrote. Facebook / Mary Grace Westman

Mary Grace had signed Westman’s legal name change in 2020 —  from Robert to Robin — in apparent support of his gender-identity change. Westman was 17 at the time.

Mary Grace, who once worked at the Annunciation Catholic Church school that Robin graduated from, is now speaking with police after previously refusing to cooperate with the investigation into why her long-troubled, hate-filled son unleashed the heinous attack at his alma mater, investigators said. 

Here is the latest on the mass shooting at a Minneapolis Catholic school:

“I can tell you this, through working with our partners with the Bureau of Criminal Apprehension of Minnesota there has been conversation, and I am not at liberty to go any further than that,” Minneapolis Assistant Chief Christopher Gaiters said during a press conference Friday afternoon. 

The mom has retained criminal defense attorney Ryan Garry, according to Fox News. 

Despite the antagonistic feelings displayed in the manifesto, Westman penned a separate letter to his family and friends telling them how much he loved them and how his parents shouldn’t blame themselves with how he turned out. 

Westman admitted in a series of disturbing online videos to regretting being brainwashed into “being trans.” Obtained by NY Post

“You did not fail me, you gave me so much. I truly appreciate the love you have given me,” Westman said to his parents. “I feel I was raised to be a good person.

“I’ve kept those traits of empathy, self-sacrifice, and good character. Please do not think you have failed as parents,” he added. 

He admitted in a series of disturbing online videos that he regretted being brainwashed into “being trans,” and planned to cut his long hair before unleashing his carnage, in which he planned to kill far more kids.

Jen Labanowski, her daughter Lucy (R), and her daughter’s friend Cece Degnan (C), light candles at a memorial for victims of yesterday’s shooting in front of Annunciation Catholic Church on August 28, 2025 in Minneapolis, Minnesota. Getty Images

Westman also wrote that he could neither stop smoking — which he suspected without apparent evidence had given him cancer — nor the attack that claimed two lives and left 18 others wounded at the Annunciation Church on Wednesday. 

“I wish I could stop vaping but I can’t! If I could stop vaping, I could stop myself from doing this attack, but I just don’t want to. Stopping vaping will not get rid of my cancer, nor will it make these fantasies go away.”

The twisted gunman eventually put his plan into motion on Wednesday, when he opened fire through the church’s stained glass windows during morning Mass, killing an 8-year-old Fletcher Merkel and 10-year-old Harper Moysk.

Westman unloaded 116 rifle rounds and turned the gun on himself before authorities could reach him.