An assistant principal and her mom were gunned down outside of her suburban Chicago middle school by her husband, who then turned the gun on himself after shooting at cops.

Nerissa Lee, 46, and her 76-year-old mother were killed at the end of the school day Tuesday while sitting in a car outside Lincoln Middle School in Berwyn, a few miles from Chicago, the Chicago Sun-Times reported .

Lee’s husband, Steven T. Lee, pulled up beside them and shot them with a rifle, cops said. 4

The deranged husband then fired at responding police officers before shooting himself in the head, police said.

One horrified witness reported hearing almost two dozen gunshots.

“It was really like 20 times … very noisy, so they made me come to the front. When I came over here, I see by the corner — righ

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