CHARLOTTE — The anguished mother of accused Charlotte train killer Decarlos Brown Jr. said she tried to get her schizophrenic son help — but was turned away.

In an exclusive interview with The Post, Michelle Dewitt also asserted that he should never have been walking free as his mental health was rapidly deteriorating.

“He shouldn’t have been released,” Dewitt, 51, said of him being free on a “written promise” to appear for a court date after his latest arrest in January. 5

Dewitt said she had taken her son to a homeless shelter just days before the barbaric caught-on-camera stabbing of 23-year-old Ukrainian refugee Iryna Zarutska — and that he had grown increasingly aggressive with both her and her husband.

She batted down claims Brown allegedly attacked Zarutska because sh

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