Reis continued his work at Folha de S.Paulo until his death in São Paulo; he died of complications of multiple pneumonia in 2002, at 94 years of age. His latest work, Ética e Divulgação Científica: Os Desafios do Novo Século (Ethic and Cientific Divulgation: The Challenges of the New Century), fifth in the Science Popularization Series, was published in the same year.
