New details have emerged about the Charlotte train killing of Ukrainian refugee Iryna Zarutska, as the accused suspect, 34-year-old Decarlos Brown Jr., offered a rambling explanation in a jailhouse phone call to his sister, as reported by The New York Post.

Zarutska, 23, was fatally stabbed on August 22 while riding a Lynx Blue Line train in Charlotte, North Carolina. Police say Brown attacked her without provocation, plunging a knife into her neck.

He has since been charged with state counts of first-degree murder and a federal count of committing an act causing death on a mass transportation system.

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According to audio obtained by the Daily Mail, Brown told his sister, Tracey Brown, during an August 28 call from jail that “the material in his body” was responsible for the attack.

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“I hurt my hand, stabbing her. I don’t even know the lady. I never said not one word to the lady at all. That’s scary, ain’t it. Why would somebody stab somebody for no reason?” Brown said.

When Tracey asked why he targeted Zarutska, Brown responded:

“They just lashed out on her, that’s what happened. Whoever was working the materials, they lashed out on her. That’s all there is to it. Now they really gotta investigate what my body was exposed to … Now they gotta do an investigation as to who was the motive behind what happened.”

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Tracey, who said she was previously assaulted by her brother in 2022, has described him as a paranoid schizophrenic. She told CNN that he frequently claimed the government implanted a chip in his body.

Their mother also said she had attempted to get Brown admitted to long-term mental care but was unable to because she lacked legal guardianship.

Court records show Brown’s mental health issues had already led to multiple encounters with police. On January 19, he was arrested after calling 911 and claiming his brain was being controlled by a microchip.

According to the arrest affidavit, officers informed him it was a medical issue and could not be handled by police. He then became combative and was charged with misuse of the 911 system.

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At a January 21 hearing, Magistrate Judge Teresa Stokes granted Brown cashless bail on a written promise to appear in court. The judge also ordered a psychiatric evaluation, but according to Tracey, the assessment was delayed for more than a year.

“He was seeking help. He called 911 multiple times. Instead of talking to him, they thought charging him was going to help,” she said.

Tracey added that her brother’s behavior worsened after his release from prison in 2022 following a five-year sentence for armed robbery.

“He didn’t seem like himself,” she recalled, describing his aggression, inability to hold conversations, and difficulty maintaining employment. She said her brother was “not safe for society” and that “an innocent woman is dead” because he remained free.

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The case against Brown is ongoing as prosecutors weigh both state and federal charges.