A Salvadoran immigrant who was being held at a troubled federal detention center in Newark died during the weekend, according to the city’s mayor and Senator Andy Kim.

Federal officials confirmed the death of the man, who was being held at the detention center, Delaney Hall, to Mr. Kim’s office, according to the senator’s spokeswoman. Ras Baraka, the city’s mayor, identified the detainee as Edwin Jovanny Lopez Cornejo.

“In less than a year, yet another family is forced to endure the unimaginable loss of a loved one while in custody at Delaney Hall,” Mr. Baraka said in a statement.

In December, Jean Wilson Brutus, 41, died after a medical emergency, federal officials said at the time. Delaney Hall was reopened last year to accommodate President Trump’s expanding immigration crackdown.

Officials with the Department of Homeland Security and the Immigration and Customs Enforcement agency, which oversee Delaney Hall, did not immediately respond to questions about Mr. Lopez Cornejo’s death. A spokeswoman for the Newark Department of Public Safety directed inquiries to the Justice Department, which did not immediately respond.

Katey Sabo, a spokeswoman for Mr. Kim, a New Jersey Democrat, said that officials at the ICE field office in Newark confirmed Monday to the senator’s office that a Delaney Hall detainee had died in federal custody.

Gov. Mikie Sherrill of New Jersey condemned the man’s death and expressed support for his family while demanding answers from the federal government about what happened.

“My administration is working with our congressional delegation to gather all the facts surrounding this death,” Ms. Sherrill said. “This tragedy is another painful reminder of why Delaney Hall should be closed.”

This is a developing story. Check back for updates.