Austrian authorities say a man suspected in the killing of an American woman in her Vienna apartment earlier this year has been extradited by Switzerland.

Vienna state court spokesman Christina Salzborn says the transfer took place early Monday. The man is now being detained ahead of a formal decision on keeping him in investigative custody. He has not been identified in line with Austrian privacy laws.

The victim, 25-year old Lauren Mann of Colorado, was found dead in her flat in January. Police and firefighters who forced open her door found her body on a mattress in the bedroom. Police say she was suffocated.

Mann had been working as an au pair, and police were alerted by Mann's employer after she did not show up for work.