Ilya Segalovich, Co-Founder and Chief Technology Officer of Russia's leading search engine, Yandex, died on Wednesday aged 48, the company says in an official statement. 

Segalovich had been diagnosed with a treatable form of cancer and was responding well to treatment and working a full schedule, before unexpectedly succumbing to complications last night, according to Yandex's statement. 

"Ilya's contributions to the founding and development of Yandex were invaluable. More importantly, his philanthropic contributions touched many children in need. My thoughts and those of all of the Yandex family are with Ilya's family at this difficult time. We know that the strong technical team Ilya helped to build will carry on the work Ilya cared so passionately about. Ilya was an encyclopedia in technology and his highest ethical standards has always set the landmark for us all," Yandex CEO Arkady Volozh has said. 

Segalovich co-founded Yandex more than 20 years ago and has been the company's Chief Technology Officer and a director since 2000. He also helped create the National Corpus of Russian Language.

Segalovich was a co-founder of Maria's Children Art Rehabilitation Center for orphans and children with special needs.

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