An Egyptian court sentenced Mahmoud Ezzat, the former acting leader of the Muslim Brotherhood, to life in prison on Thursday, months after he was detained in a Cairo apartment.
Ezzat's lawyer could not immediately be reached. At the time of Ezzat's arrest, the Brotherhood said he had been pursued on "false political charges".
Ezzat was an influential former deputy to Brotherhood leader Mohamed Badie, and considered a hardliner within the group. He became acting leader after Badie's arrest in August 2013.
Ezzat had previously been sentenced to death and to life in prison in absentia, but faces retrials following his detention.
Other senior members of the group have been jailed or left the country.
Egyptian authorities accuse the Brotherhood of promoting militancy and subversion, accusations it strongly denies.