The mother and sister of Decarlos Brown, the suspect in the fatal stabbing of a Ukrainian woman on Charlotte light rail, say that he struggled with mental illness for years after being released from prison and that he claimed there was a "material" in his body that controlled him.

Brown, 34, was arrested on Aug. 22 after police say he stabbed 23-year-old Iryna Zarutska three times while riding the Lynx Blue Line in Charlotte, according to an affidavit obtained by ABC News.

In audio recordings of a conversation between Brown and his sister several days after his arrest, obtained by ABC News, Brown maintains that he has "material" in his body that caused him to attack Zarutska.

"Make sure it was me that did it, not the material. And I'm telling you, the material did it," Brown said, accor

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