A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mailroom at the U.S. penitentiary in Atwater, California, according to a bureau spokesperson.

A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mailroom at the U.S. penitentiary in Atwater, California, according to a bureau spokesperson.

A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mailroom at the U.S. penitentiary in Atwater, California, according to a bureau spokesperson.

A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mailroom at the U.S. penitentiary in Atwater, California, according to a bureau spokesperson.

A Federal Bureau of Prisons worker at a high-security penitentiary in California died on Friday after coming into contact with an “unknown substance” while working in the mailroom. Marc ...

An inmate at the Federal Correctional Institution in Bennettsville has died after an employee found him unresponsive in his cell early Monday morning.

A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mailroom at the U.S. penitentiary in Atwater, California, according to a bureau spokesperson.

A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mailroom at the U.S. penitentiary in Atwater, California, according to a bureau spokesperson.

A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mailroom at the U.S. penitentiary in Atwater, California, according to a bureau spokesperson ...

Hans Neleman/Getty Images/STOCK (ATWATER, Calif.) — A Federal Bureau of Prisons employee died after coming into contact with an unknown substance in the mail room at the U.S. penitentiary in ...