"The Paris prosecutor's office said that "an investigation to establish the causes of death" had been opened, noting that no suspect was found at the scene on Tuesday evening."

Its a strange announcement.

It's a mistranslation, the original quote is "Une enquête en recherche des causes de la mort est ouverte afin de déterminer l’origine du décès, aucun élément suspect n’ayant été découvert sur place par les services primo-intervenants. Les investigations sont en cours", which translates to "no suspicious element was found", not "no suspect was found"

Thanks for clarifying

Purely speculative but he's been known for his excessive drinking for a while now, sad news.

Authorities believe it was a stroke, he had been complaining of headaches for several days prior.