The crazed knife-wielding woman who stabbed two people near Times Square long struggled with her mental health, but showed no sign she’d go murderously berserk, her stunned brother said Tuesday.

Pamela Cisneros, 49, seemingly lived a normal life in the days before she fatally knifed a woman and seriously wounded a man during a terrifying random attack Monday, said her brother Patrick Peralta, 59.

“She never showed any aggressiveness or being violent. I don’t know what happened,” Peralta, 59, told The Post.

Shocking video shows NYPD cops confront Cisneros, still clutching two knives, after the two attacks near West 41st Street and Seventh Avenue…

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