Ola is Sicilian but speaks American English without a foreign accent. Ola is part of Roth's plan to assassinate Michael Corleone at his home at Lake Tahoe, with unwitting help from Michael's brother Fredo. When Michael asks if Fredo and Johnny had ever met, they deny knowing each other, but Fredo later inadvertently reveals that he and Ola had visited a sex club together in Havana; Michael then realizes that Fredo had betrayed him. Michael sends his bodyguard Bussetta to kill Ola and Roth. Bussetta strangles Johnny Ola before attempting to kill Hyman Roth.