A former Turkish police intelligence chief has been detained as part of an investigation into negligence by officials in the 2007 murder of ethnic Armenian journalist Hrant Dink.
Ramazan Akyurek was detained on February 26 in Ankara.
Dink was gunned down outside the office of his newspaper, Agos, by a teenage nationalist who was convicted in 2011. The trial, however, failed to shed light on alleged official negligence or collusion.
Dink campaigned for reconciliation between Turks and Armenians, making waves in a country whose relations with Armenia are still severely strained over the mass slaughter and deportation of up to 1.5 million Armenians by Ottoman Turks a century ago.
A Turkish court ruled in June to reopen a negligence probe.
Akyurek was among hundreds of police removed from their posts amid a purge of officers believed to be linked to a movement led by a U.S.-based Islamic cleric, which is accused of orchestrating corruption allegations targeting officials.
In January, two Turkish police officers were arrested on suspicion of failure to prevent Dink's murder.