A gunman dressed as a FedEx driver shot and killed the federal judge's son assigned to Jeffrey Epstein's case.

The shooting happened at the home of Esther Salas, 51, District Court judge, in North Brunswick, New Jersey.

Police say the shooter disguised as a FedEx driver during the attack.

The gunman killed Salas' 20-year-old son Daniel Anderl, critically injuring her defense attorney husband, Mark Anderl, 63.

According to family friends, Daniel, the couple's only child, opened the door. Immediately, the shooter opened fire, shooting him 'in the heart.'

Before the gunman fled, he shot the husband several times after he came to investigate the noise.

51-year-old Salas reportedly survived the ambush as she was in the basement at the time.

The shooting comes just days after Salas was assigned a case with links to Epstein.

However, the motive for the shooting isn't clear. Police say they have yet to find evidence of a link between the attack and the judge's work.

Salas has been a judge of the US District Court for New Jersey in Newark for nine years.

She's the first Latina to serve on the federal bench in the state. And she has presided over several high-profile cases over the years.

She sent TV stars Teresa and Joe Giudice from the Real Housewives of New Jersey to jail for tax evasion and fraud.

Salas then staggered their sentences so that one of them could be available to take care of their four daughters.

Her most recent ongoing lawsuit involves a civil financial fraud case tied to Jeffrey Epstein. The Deutsche Bank investors filed the case.

According to the investors, the bank made false and misleading statements about its anti-money laundering policies. It also failed to monitor 'high-risk' customers, including convicted sex offender billionaire Jeffrey Epstein.

Salas's husband, Mark, is also a well-regarded criminal defense attorney. He was a prosecutor for 10 years before switching to private practice.

While her son, Daniel, was preparing to enter his junior year at the Catholic University of America in Washington.

He made it to the School of Arts and Science's Dean's List for the spring semester.

University President, John Garvey, tweeted:

"I was shocked last night to hear news of Daniel Anderl's tragic death."

"We all mourn and grieve this loss to our university community."

"Our deepest condolences go out to Daniel's parents, Esther Salas and Mark Anderl. We pray too for Daniel's father, who is in the hospital."

Daniel planned to attend law school to follow in his parents' footsteps.