A 25-year-old woman was killed in Essen and found in her apartment.
The police arrested a suspect about the same age as the young woman, a police spokesman said on Monday morning.
Accordingly, she was discovered on Sunday evening in her apartment in the south-east of the city.
The woman's body was to be autopsied on Monday.
Essen - According to the police, further details on the background of the crime were initially completely unclear.
The investigation continued.
The media had previously reported.
dpa