Word spread quickly inside the windowless walls of the Elizabeth Detention Center, an immigration jail in New Jersey: A detainee had fallen, injured his head and become incoherent. Guards had put him in solitary confinement, and late that night, an ambulance had taken him away more dead than alive.

But outside, for five days, no official notified the family of the detainee, Boubacar Bah, a 52-year-old tailor from Guinea who had overstayed a tourist visa. When frantic relatives located him at University Hospital in Newark on Feb. 5, 2007, he was in a coma after emergency surgery for a skull fracture and multiple brain hemorrhages. He died there four months later without ever waking up, leaving family members on two continents trying to find out why.

Mr. Bah’s name is one of 66 on a government list of deaths that occurred in immigration custody from January 2004 to November 2007, when nearly a million people passed through.

The list, compiled by Immigration and Customs Enforcement after Congress demanded the information, and obtained by The New York Times under the Freedom of Information Act, is the fullest accounting to date of deaths in immigration detention, a patchwork of federal centers, county jails and privately run prisons that has become the nation’s fastest-growing form of incarceration.