The US astronaut Jeanette Epps has been removed from her upcoming mission to the International Space Station (ISS) just months before launch.
Dr Epps was to have been the first African-American astronaut assigned to the space station crew.
She would have flown aboard a Russian Soyuz flight in June but is being replaced by another astronaut.
She worked as a technical intelligence officer for seven years before being selected as a member of Nasa's 2009 astronaut class.
Image copyright NASA Image caption The Syracuse-born astronaut was to have flown to the space station in June.
In a statement, they said she would "return to Nasa's Johnson Space Center in Houston to assume duties in the Astronaut Office".
Dr Auñón-Chancellor previously spent more than nine months in Russia supporting medical operations for space station crew members. »