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KILLER’S NEW LIFE – BABY SLAYER BRIAN HAS IT GOOD IN FLA.

Brian Peterson – the privileged New Jersey youth who made headlines in 1996 when he and his girlfriend Amy Grossberg killed their newborn baby – is out of jail, married to another woman, and living in Florida.

He spoke to The Post recently as he and his wife Jaime took a stroll in the town of Jupiter with their two dogs – and showed he was in no way marking the short life of his son.

“It was seven years ago,” Brian Peterson said when approached outside his swank townhouse.

The significant date to him was apparently July 1998 – when Peterson, along with his Wyckoff, N.J., high school sweetheart, copped a manslaughter plea and began prison terms for killing their newborn son.

And neither Grossberg – then a college freshman who had the baby on Nov. 12, 1996, in a Delaware hotel room, then ordered her beau to “get rid of it!” – nor Peterson, who complied by putting the baby in a plastic bag and then tossing him in a trash bin, has been at the baby’s grave in years.

The grave is in a tranquil, tree-filled memorial park off a busy Jersey highway.

Officials who run the burial park have never met Grossberg, Peterson, or either set of the baby’s grandparents.

Noted one: “I’ve never seen any of them here.”

A woman with a loved one buried near the tragic infant said, “I come all the time, and I have never once seen anyone mourning that little boy.”

After his death, the baby – who autopsy results showed died from skull fractures and brain injuries from blunt trauma and shaking – lay unclaimed in a Delaware morgue for weeks.

He was buried, in a donated coffin, in late December 1996. Nobody from the Grossberg or Peterson families attended the burial.

Peterson did visit the grave, alone, before he began his jail sentence, prosecutors for the case have said.

But today, it would be a long trip for Peterson, who recently relocated from Wyckoff – along with his mom, Barbara Zuchowski, and stepdad – to Jupiter, Fla., where he works for his family’s video company.

Sprung from jail in January 2000 – after cooperating with prosecutors and serving 18 months of a 24-month manslaughter sentence – Peterson is now married to Jaime Chabora, a pretty blond college student.

Records show the couple recently shelled out $230,000 for a massive new townhouse.

Both declined to discuss the past or their new life on a recent evening as they were out walking their two dogs in a neighborhood teeming with school-aged kids and neighbors pushing newborns in strollers.

“It was a long time ago,” Peterson said. “I have nothing to say about it.”

Grossberg, meanwhile, has kept a low profile since her May 2000 release from prison, where she served 24 months of a 30-month sentence.

Records show she is still living in the pricey Wyckoff townhouse of her parents, Alan and Sonje – who, from the time of their daughter’s arrest and through her sentencing – maintained Amy “did nothing wrong.”

A gifted artist, Grossberg launched her own company, called Just Because Invitations, last February.

At her sentencing, Grossberg – who had denied her pregnancy, denied giving birth, and then blamed Peterson for killing the baby – nevertheless pleaded for leniency and told the judge, “I want to help others. I want to make a difference.”