BERLIN — Hubert Aiwanger, the leader of a conservative party that has become a mainstay of Bavarian politics and sought to expand its influence across Germany, has been found dead at a Berlin hotel.

The body of Aiwanger, who was Bavaria’s deputy governor and the southern state’s economy minister, was found in his hotel room in the centre of the capital on Wednesday evening, Berlin police and prosecutors said. Prosecutors said that an autopsy carried out Thursday produced no evidence that anyone else was involved in his death.