151 police have concluded that a colorado woman who was found dead in vienna this week had died from suffocation lauren mann 25 had been living in the austrian capital and was working as an au pair or nanny for a local family she was found dead in a pool of blood on tuesday at 6 pm in her apartment according to vienna police her body was halfundressed according to thomas keiblinger a vienna police spokesperson today the citys prosecutor nina bussek told abc news that mann had suffocated investigators have not yet determined if someone else was involved in her death american au pair found dead in vienna keiblinger previously told abc news that a preliminary autopsy showed mann has not been stabbed or strangled and there were no external wounds on her body there are no suspects or arrests at this time according to police officers have been in contact with manns friends lauren mann is seen here in this undated file photo lauren mannfacebook the family for whom mann worked said in an interview that mann was very reliable trusted caring and socially active family members became concerned when one of their children was not picked up from school on monday manns neighbor peter kratochwill told abc news it was extraordinary for something like this to happen in a neighborhood that is so quiet and safe the us embassy in vienna is providing consular assistance abc news louise dewast contributed to this report