The news from various sources in Brazil (saocarlosagora.com.br and here) indicate that Dodonov was killed while bicycling. It's mixed whether he was hit by a vehicle while bicycling or had fallen.
Eugeni Dodonov was born in Russia but had been studying and working in Brazil the past few years, including while contributing to the open-source Intel Linux graphics driver.
Most recently Dodonov was working on the Intel Haswell graphics driver.
Prior to becoming a software engineer at Intel in August of 2011, he worked at Mandriva as a development manager / engineering team leader / system engineer for several years, and back in 2007 he served briefly as a software development engineer at Microsoft.