Italy's 5-Star Movement co-founder Casaleggio dies

Italy's Five Star Movement co-founder Gianroberto Casaleggio waves to supporters during an election campaign for European Elections in Rome in this May 23, 2014 file photo. REUTERS/Remo Casilli/Files

ROME (Reuters) - The co-founder of Italy's anti-establishment 5-Star Movement (M5S), which fed off anger over the European financial crisis to become Italy's second largest party, died on Tuesday, his long-time collaborator Beppe Grillo said.

A web developer and strategist who seldom appeared in public, Gianroberto Casaleggio masterminded most of the strategy for M5S, which pioneered what it said was direct democracy, using online ballots to decide strategy and select candidates.