Reuters/Hannibal Hanschke
The suspect suffered life-threatening injuries in a gunfight with police officers outside the music venue after they had rushed to the scene shortly after the incident around 0230 GMT.
The suspect was taken to hospital and later died. The motive for the shooting is unclear. One police officer was also injured in the exchange of fire with the suspect.
Police said in a statement that special commando forces have been deployed in the city.
The suspect "was critically injured in a shootout with police officers as he left the disco, and later succumbed to his wounds in hospital," police said in a statement, per AFP. "The motives of the man, who probably acted alone, are not known yet."
On Friday, a failed asylum seeker killed one person and injured six others in the northern city of Hamburg. Officials said he was an Islamist known to security forces and he had was psychologically unstable.