A Guatemalan immigrant who had been taken to a troubled detention center in Newark last month experienced a medical emergency and died after having been transferred to a hospital, federal officials said on Wednesday.

The man, Jose Chajon-Raxon, is the third immigrant to have died after being detained at the center, known as Delaney Hall, which reopened in May 2025 as part of the Trump administration’s immigration crackdown.

Mr. Chajon-Raxon had been arrested by Immigration and Customs Enforcement agents and then taken to Delaney Hall on July 18, according to a statement issued on Wednesday by the Department of Homeland Security, the parent agency of ICE.

The next day, a nurse saw him experiencing what appeared to be a seizure, the statement said. Medical workers were summoned, and Mr. Chajon-Raxon was taken to a hospital, which the statement did not identify.

“While waiting for first-responders to arrive, Chajon-Raxon was provided proper medical care from the nurse, who reassured him he was safe,” the Department of Homeland Security said in the statement. “The nurse gave a comprehensive report to first-responders, and Chajon-Raxon was taken to the hospital.”

The department said that Mr. Chajon-Raxon died but that ICE had not been notified of his death. It was not immediately clear when he died.

Representatives of University Hospital in Newark, which is where Delaney Hall detainees who need treatment are often taken, did not immediately respond to questions on Wednesday evening about Mr. Chajon-Raxon’s death. Attempts to reach his relatives were not successful.

The Department of Homeland Security said in its statement that Mr. Chajon-Raxon had been “released from ICE custody on July 22,” but did not elaborate.

In June, ICE officials stopped reporting the deaths of those detainees who had been released from federal custody. The decision has been criticized by Democratic officials who have accused the federal government of ignoring its responsibility to keep migrants safe.

The Department of Homeland Security said that the reporting change was “common sense.”

“ICE is not responsible when an individual passes away weeks after leaving their custody,” the department said.

Representative Rob Menendez, a New Jersey Democrat, said that he had been given conflicting information about Mr. Chajon-Raxon’s death and that he had visited Delaney Hall on Aug. 3 to inquire about it.

“It is consistent with everything ICE tries to do to avoid transparency and accountability,” Mr. Menendez said. “This is an abuse and the creation of a loophole to avoid having to investigate the death and provide congressional and public notification of the death.”

Earlier this month, an immigrant from El Salvador, Edwin Lopez-Cornejo, 41, died after experiencing a medical emergency at Delaney Hall. Mr. Lopez-Cornejo was pronounced dead on Aug. 1 by medical workers at University Hospital. The cause of his death is not known.

In December, a Haitian immigrant, Jean Wilson Brutus, also 41, similarly died after a medical emergency, federal officials said at the time.

The recent deaths occurred amid growing criticism over conditions at the detention center.

Lawmakers called for better treatment of inmates after The New York Times published an article last month that provided some of the first documented evidence of deficiencies in Delaney Hall’s medical care and kitchens.

On Friday, the New Jersey attorney general, Jennifer Davenport, opened a civil rights investigation into Delaney. Ms. Davenport said that her office had issued subpoenas and would investigate whether employees at the center had violated the civil rights of detainees.

In June, New Jersey sued the Geo Group, the private company that operates the detention center, after state health officials were denied access to the medical unit and several other areas at Delaney during an inspection. That litigation, which remains unresolved, is seeking to force the company to grant inspectors full access.

Federal immigration officials have insisted that detainees are treated well, and that ICE has detention standards that exceed those of most American prisons.

“It is a longstanding practice to provide comprehensive medical care from the moment an alien enters ICE custody,” homeland security officials said on Wednesday. “This includes medical, dental and mental health services as available, and access to medical appointments and 24-hour emergency care.”

Sheelagh McNeill contributed research.