Her face still haunts me, now more than ever.

Susan Smith, the evil, young married mother who in 1994 slowly and painfully murdered her two young sons in a twisted scheme to win the heart and other organs of the richest guy in her hometown of Union, S.C., has learned nothing in three decades in prison.

Nothing, that is, except how to be a better and more manipulative sociopath, using her body and her imagination to rope in accomplices to help satisfy her bottomless need for attention and her endless lust.

In a few weeks, Smith, now 52, who’s been behind bars for decades for this incredibly cruel double murder, is up for parole.

But after years spent spreading nothing but excuses for her treachery, enjoying drugs, attracting long-distance suitors and even the sexual favors of the guards she pursued, it’s clear that prison has only made her a bigger monster.

She should never again breathe the air of a free woman.

Back in 1995, I published a definitive book about her case – “Mother Love, Deadly Love, the Susan Smith Murders” (Harper Collins).

It was shortly after Smith confessed to drowning her two, precious babies, standing by the shore near John D. Long Lake in Union County and watching her car sink agonizingly into the watery grave with the kids, 3-year-old Michael and Alexander, 14 months, strapped into their car seats.

In my book, I quoted authorities who said this was no painless death. Minutes, perhaps longer, clicked by as the car filled with water in the terrifying darkness and the boys, finally, ran out of oxygen.

They were at the bottom of the lake when Smith concocted a story meant to throw off authorities: She had been carjacked, Smith said, by a black man who drove off with the children.

The race of the kidnapper was a blatantly false detail for Smith. She apparently thought people would believe the absurdity that an African-American wanted to steal white babies.

Investigators, however, doubted her story from the start, but let her spin her tale to the international media for nine days as they pressed her for the truth.

And when that came, the damage she caused was incalculable. Not only did Michael and Alex suffer tortuous deaths, but potentially thousands of innocent men were falsely accused by a depraved woman who’d go to any lengths to get away with murder.

Her trial was a freak show. The people of Union County, from which Susan Smith hailed, defended a cold-blooded killer while accusing her blameless husband, David Smith, who’d only lived in Union for a short time, of driving her to kill with his infidelities.

Susan Smith’s claim to victimhood is the main reason she was spared the death penalty

The true picture of the demon mom never came out at trial.

In her early 20s, Susan Smith worked as a secretary for the wealthy owner of a textile mill, J. Carey Findlay.

She also had a sexual relationship with the boss’ son, Thomas Findlay. Smith was so intent on moving on from her marriage to a lowly store assistant manager to live with wealthy folks, she filed for divorce from her husband.

Then Thomas Findlay wrote her a letter breaking things off. In words he would live to regret, he told his lover he did not want children. He was clearly just brushing her. But Smith took the words to heart.

It wasn’t long before the two impediments to a bright future were gone.

For Susan Smith, sex was long a tool for getting what she wanted. Though she later learned to blame her lovers for her problems, to remake herself as a victim of the patriarchy. Of possible mental illness. Not the conniving creature she is.

Her many men, of course, should be condemned for their sexual indiscretions. One was Smith’s own stepfather, whom Smith pursued as a way to punish her mother.

Others include two now-fired prison guards, whom Smith pleasured in an effort to get favorable treatment in stir.

Still more men she accumulated as pen pals who profess their love and devotion. It’s doubtful Susan Smith is honest about her history.

I look at a recent photograph of the incarcerated villain and I’m taken by how much prettier she looks now compared to her early 20s.

Prison has taught her how to leverage her sexuality and turn it into sympathy. To speak the language of victimhood. Don’t be fooled.

The only two victims here are Michael and Alex, two little boys who never grew up.

If there is justice in this world, Susan Smith should rot.