Rakhat Aliyev, the Kazakh president's former son-in-law turned opponent, has been found dead in an Austrian jail from an apparent suicide, a court spokeswoman said on Tuesday.
"He committed suicide," the spokeswoman said.
Austrian prosecutors in December had charged him with the murder of two bankers in 2007, a case in which Kazakhstan has repeatedly requested his extradition.
Aliyev, once Kazakh ambassador to Austria who became a vocal critic of President Nursultan Nazarbayev, had denounced the case against him as politically motivated. He had been in custody since June when he turned himself in to Austrian authorities.
(Reporting by Michael Shields; Editing by Alison Williams)