A gunman dressed as a FedEx driver shot and killed the son of a federal judge and wounded her husband on Sunday, July 19, at their home in North Brunswick, New Jersey, according to law enforcement sources.

NJ.com reported that the shooting occurred at the home of U.S. District Judge Esther Salas around 5 p.m. Her son Daniel Anderl, 20, was killed, according to The Associated Press.

Salas’s husband, defense lawyer Mark Anderl, 63, is in critical but stable condition as of Monday morning, according to ABC News. Salas was in the basement at the time and was unharmed, the report said.

In a statement, the FBI Newark office said, “The FBI is investigating a shooting that occurred at the home of Judge Esther Salas in North Brunswick Township, New Jersey earlier this evening, July 19. We are working closely with our state and local partners and will provide additional updates when available.”

U.S. Marshals and state and local authorities are also investigating.

The suspect is a white man who posed as a delivery driver for FedEx, NJ.com reported.

A FedEx representative said the company is “fully cooperating” with the investigation.

Salas, 51, was the first Latina appointed to the U.S. District Court in New Jersey.

Salas has been presiding over a lawsuit brought by Deutsche Bank investors who claim the company made false and misleading statements about its anti-money-laundering policies and failed to monitor “high-risk” customers including convicted sex offender Jeffrey Epstein.