A Russian cryptocurrency billionaire died in a helicopter crash near Monaco, despite good weather in the area, the third cryptocurrency entrepreneur to die unexpectedly in recent weeks.

Vyacheslav Taran, 53, died after the helicopter crashed near Villefranche-sur-Mer after lifting off from Lausanne in Switzerland. The French pilot also died. …

France Bleu, a French media network, also reported that another passenger canceled at the last minute, though details regarding the other passenger were unavailable.

The mystery regarding Taran’s deadly crash adds to other sudden deaths involving cryptocurrency leaders. Tiantian Kullander (also known as “TT”), 30, reportedly died in his sleep last week.