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Photo: John McDoughall / AFP
In an apartment in Essen, the police found a seriously injured 19-year-old on Tuesday night.
The emergency doctor who was called could only determine the man's death, said a police spokeswoman.
The man's 15-year-old brother was arrested.
According to the information, family members had alerted the police at around 2.30 a.m.
Several family members lived in the apartment.
Police believe there were other people in the home at the time of the crime.
The background to the fact is so far unclear.
The police did not provide any information about the possible murder weapon and the injuries to the 19-year-old.
Forensics were still on site on Tuesday morning.
A homicide detective is investigating.
fek/dpa
