UPDATE: Roy Den Hollander, a lawyer was the man who killed the son of the US federal judge

The gunman suspected of killing the son and wounding the husband of a federal judge in New Jersey before taking his own life in New York’s Catskills has been identified as lawyer and men’s rights activist Roy Den Hollander, federal sources said.

According to a report by the New York Post, Hollander — whose website details “anti-feminist cases” and calls for clients to “help battle the infringement of Men’s Rights by the Feminists” — was found dead in Rockland County, NY on Monday, according to sources.

Investigators believe Hollander shot himself hours after an attack on the North Brunswick, NJ, home of federal Judge Esther Salas.

A gunman dressed in a Fed Ex uniform came to the home around 5 p.m. Sunday, and opened fire when the door was opened, according to sources.

Salas’ son, Daniel Anderl, 20, was fatally shot, while his father, prominent attorney Mark Anderl, 63, was critically wounded.

Salas, believed to have been in the home’s basement at the time, was unharmed.

The jurist had been assigned a number of high-profile cases over the years — including, recently, a class-action suit from Deutsche Bank investors who claim the company failed to monitor “high-risk” customers like late pedophile Jeffrey Epstein.

Hollander had a case pending before Salas, challenging the military’s men-only draft, according to The Daily Beast, which first reported his involvement in the case.

But ABC 7 NY has reported that investigators believe Salas’ husband was the intended target.

The motive remains unclear.

On Monday, Hollander was found dead, surrounded by a gun possibly used in the attack, and a package or envelope addressed to Salas, according to sources.