Mango founder Isak Andic died unexpectedly in an accident in Barcelona.Lorena Sopena/Europa Press via Getty ImagesIsak Andic, the founder of the fashion brand Mango, has died in an accident, the company said.Andic fell into a ravine while hiking in caves near Barcelona, according to reports.Andic and his family have an estimated net worth of $4.5 billion, according to Forbes.Isak Andic, the billionaire founder of the European fashion company Mango, died on Saturday.