A major bitcoin investor has suddenly died, leaving behind a cryptocurrency fortune reportedly worth more than $2 billion. Mircea Popescu, a Romanian national, drowned last week off the coast of Costa Rica, local reports said. He was 41. Popescu drowned at Playa Hermosa, according to Teletica.com, which reported that Popescu was swept away by the current and died. His death has prompted questions surrounding what will now happen to Popescu's enormous bitcoin fortune. Popescu, a controversial figure sometimes referred to as "the father of bitcoin toxicity," is known for launching a "bitcoin securities exchange" called MPEx in 2012, according to...