Ms. Costanza said that Judge Salas previously remarked that being a public figure could make her a target.
“She had some high-profile cases, and she was always a little concerned,” said Ms. Costanza, who attended Judge Salas’s swearing-in ceremony when she became a federal judge.
Ms. Costanza said that the judge and her family were caring neighbors, and recalled the time when Daniel Anderl brought her supplies during a snowstorm.
“There’s no one like them,” she said. “They’re extremely good-natured. They would do anything for anyone.”
The younger Mr. Anderl went to Saint Joseph High School in Metuchen, N.J., and played baseball, according to Ms. Costanza, who said that Judge Salas had been wistful when her son went off to Catholic University in Washington, D.C.
“I think she cried for a week and that’s just in D.C.,” she said. “He was her only child.”
Judge Salas was the first Hispanic woman to serve as a federal judge in New Jersey.
President Barack Obama nominated her to the United States District Court for New Jersey in 2010. She had previously served as a magistrate judge and an assistant federal public defender.