Anthony George, who stabbed Gunasekara to death in February 2014, will have his sentence automatically commuted to life in prison as Sri Lanka has an unofficial moratorium on capital punishment.
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High Court judge Piyasena Ranasinghe also found George guilty of breaking and entering and of stealing Gunasekera's mobile phone.
During a lengthy trial, the court heard that he had murdered Gunasekera after she recognised him as a labourer who had been hired over a month earlier to paint her parent's house.
Gunasekera, 40, was an assistant vice president at Fitch's Sri Lankan operation, a position she took up in 2012 after a five-year stint as Colombo correspondent for AFP.
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She reported extensively on financial and political affairs in Sri Lanka, and also covered the Maldives.
She was the founding editor of Lanka Business Online, a pioneering financial news portal in the island.
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