'Why I Killed Jeffrey Dahmer'

Maybe because the cannibal was one of the nation’s creepiest psychopaths ever? The prison inmate who put paid to the Milwaukee madman’s flesh-eating orgy of death tells all:

Serial killer Jeffrey Dahmer was done in by his uncontrollable lust for human flesh, the man who whacked him in prison 20 years ago told The Post, revealing for the first time why the cannibal had to die.

Christopher Scarver — who fatally beat the serial killer and another inmate in 1994 — said he grew to despise Dahmer because he would fashion severed limbs out of prison food to taunt the other inmates. He’d drizzle on packets of ketchup as blood. It was very unnerving.

“He would put them in places where people would be,” Scarver, 45, recalled in a low, gravelly voice. “He crossed the line with some people — prisoners, prison staff. Some people who are in prison are repentant — but he was not one of them.”

In case you’ve forgotten who Jeffrey Dahmer was, or what he did to 17 men and boys (many of them black) during his crime spree — a spree the cops could have stopped at one point when they found Dahmer with a bleeding, naked Laotian boy, but decided not to get involved because the cannibal and his soon-to-be victime appeared to be in a “caring relationship” — click here.

Scarver, who was repulsed by the youth-molesting cannibal’s lust for flesh, kept in his pocket a newspaper article detailing how Dahmer killed, dismembered — and in some cases ate — 17 men and boys from 1978 to 1991.

Scarver followed Dahmer toward a staff locker room. Scarver grabbed a metal bar from the weight room and confronted Dahmer with the news story he had been carrying in his pocket. “I asked him if he did those things ’cause I was fiercely disgusted. He was shocked. Yes, he was,” Scarver said. “He started looking for the door pretty quick. I blocked him,” Scarver said.

With two swings of the bar, Scarver crushed Dahmer’s skull. “He ended up dead. I put his head down,” he said.

Sometimes prison justice is exactly what was needed in the first place.