In the case of the dead man from Alexanderplatz, the arrested suspect came into custody.
The 22-year-old was presented to a judge on Saturday, a spokeswoman for the Berlin public prosecutor said on Sunday.
"Because of the urgent suspicion of a crime, pre-trial detention was ordered".
The man is now in custody.
The public prosecutor and the police did not provide any further details.
City cleaning workers discovered the body on Friday morning.
According to the police, the 27-year-old was found on the area between stairs and water features.
His injuries indicated a homicide.
A homicide squad started the investigation.