A 61-year-old man fell five metres from a platform during the Rosenmontag, or Shrove Monday, parade in Düsseldorf. He died on Monday evening after emergency surgery, rescue services reported on Tuesday.
The reason for the fall was unknown, but authorities said they do not suspect the involvement of any other party.
Police also reported that a 24-year-old man died on Monday evening after falling from a parade float in the Thuringian town of Viernau the day before. It was the second serious Karneval incident in the town this year.
Earlier, a 24-year-old woman fell from a window ledge of her apartment where she had been smoking a cigarette after returning from a Karneval gathering. She tumbled 15 metres to the ground, sustaining serious head injuries and breaking several bones, and is still in critical condition.
Authorities have ruled out foul play in both incidents and are still uncertain whether alcohol was involved.
Meanwhile, a Karneval parade in the Brandenburg city of Cottbus ended in disaster on Sunday, when steel scaffolding along the route collapsed onto participants.
Eleven people were injured, two severely, when the scaffolding meant to hold camera cables fell. Among the injured was a three-year-old girl.