Parts of the mystery woman have been found over the past three months in the Tollense Lake in north east Germany – but crucially her head is still missing and police have been unable to identify her.
Public prosecutor in Mecklenburg Western-Pomerania Beatrix Komning said the victim was probably between 40 and 55, and the police suspect she was killed by someone she was in a relationship with.
The authorities are therefore taking cheek swab samples from men in the region aged between 50 and 70 and started on Thursday in Neubrandenburg.
The DNA collected will be compared with a sample found on the plastic bags in which the body parts were taken to the lake.
The search for the woman's head was abandoned on Wednesday after teams had worked through the Tollense Lake and the nearby Mühlen Pond with no success.