For the next 20 years he lived in Rome and also traveled to Sorrento, Amalfi, Capri, Venice, Padua, Ravenna, Florence and Siena.
He participated in the life of the Polish art colony in Rome, and was co-founder of the Masonic lodge "Polonia".
During the annual opening of the Salon Incentives he witnessed the assassination of the first president of Poland, Gabriel Narutowicz, by Eligiusz Niewiadomski.
After the Warsaw Uprising Okuń moved to Skierniewice, where he was killed by stray bullet in January 1945.
In his paintings there are themes of a woman with long, wavy hair in Renaissance dresses which his wife posed for.