The suspect in the rape and murder of Queens jogger Karina Vetrano said he “wanted to bring a knife to school to stab all the girls” five years ago, police sources told The Post on Monday.

Chanel Lewis was just 15 years old in 2011 when he told a teacher’s aide of his violent wishes, sources said.

Lewis graduated from Martin De Porres High School, a school for emotionally disturbed students in Rockaway Park, Queens. It was not immediately clear if he was attending in 2011.

School officials called cops, who took Lewis into custody as an “emotionally disturbed person,” sources said. Lewis was later released.

The suspect’s half-sister, Theresa Forbes, 36, insisted Monday that her sibling “did not have any problem with women.

“He has nieces, and he played with them,” Forbes told reporters.

She said his behavioral issues in high school consisted of “regular stuff. He made regular problems.”

Lewis, now 20, confessed to detectives on Sunday that he killed Vetrano, 30, after he happened to encounter her as she was running along a path inside Spring Creek Park in Howard Beach, Queens, on Aug. 2.

He told cops that he was in a bad mood as he walked from his Brooklyn home to get something to eat in Howard Beach, sources said.

He said he suddenly snapped upon seeing Vetrano and attacked her, the sources said.

Lewis was held without bail Sunday night at his arraignment in Queens Criminal Court.

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