Mark Anderl survived, though he was in critical condition at last report.
Citing an unnamed judiciary official, the AP news agency reported that the son was shot once in the chest while answering the door, with his father receiving multiple wounds while standing behind him.
At about 5 p.m. Sunday, the gunman knocked at the door to the family's North Brunswick home.
The judge's husband, Mark Anderl, 63, was then shot several times.
"A brazen and cowardly act of gun violence at their home in North Brunswick", Governor Phil Murphy said in a statement. "Daniel was a rising junior, enrolled for classes beginning in the next few weeks", university President John Garvey wrote on Twitter. "He turned 20 last week", a statement from the university read. "We all mourn and grieve this loss to our University community". "A municipal employee discovered the body in a auto".
In 2018, Den Hollander argued a case before Salas, representing a mother and daughter who claimed the draft is unconstitutional because women are not allowed to register for it. Salas let the case proceed, but past year, Den Hollander asked another lawyer to take over for him because he had terminal cancer.
A FedEx package addressed to Ms Salas was found by officials investigating a vehicle associated with the suspect, according to a law enforcement source.
The son of a United States judge overseeing a lawsuit against Deutsche Bank linked to its financial dealings with disgraced financier Jeffrey Epstein has been shot and killed in an attack at their home.
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Investigators are examining Den Hollander's financial and travel records, as well as misogynistic missives he posted online, the official said, to determine whether he was responsible for shooting Angelucci.
In a statement, the Federal Bureau of Investigation said it was looking for one suspect and asked anyone who thought they might have relevant information to call them.
Anderl was formerly an assistant prosecutor in Essex County. A local mayor and family friend said Judge Salas had received threats in the past.
Den Hollander, who worked as a "men's rights" activist, railed against Salas in his self-published book, calling her "a lazy and incompetent Latina judge appointed by Obama", according to an NBC News report.
Crouch said Den Hollander did not have a good reputation among other men's rights advocates.
Judge Salas was unharmed, Judge Wolfson said.
Salas previously served as a public defender and a federal magistrate judge.