Mexico's culture secretary confirmed the singer's death, and the State Workers' Social Security Institute said he died of complications from COVID-19 after he was hospitalized on Tuesday with symptoms.
The institute said Chávez had “evident respiratory difficulty” and had a chronic lung condition. It said he tested positive for the coronavirus and succumbed to COVID-19 related pneumonia.
Culture Secretary Alejandra Frausto wrote in her Twitter account: “Thank you, Oscar Chávez, your life was journey worthy of you! My deepest sympathy to your relatives, friends and companions in struggle and song.”
Interior Secretary Olga Sánchez wrote: “I have learned to my deep regret that a voice of the struggle has been silenced. My deepest sympathy to the family of Oscar Chávez.”
Chávez sang ballads since the 1960s and played in public as recently as 2019.
Mexico has reported 19,224 confirmed coronavirus cases and 1,859 deaths.
On Thursday, Miguel Angel Osorio Chong, a former interior secretary and current senator for the old ruling Institutional Revolutionary Party, wrote in his Twitter account that he had tested positive for the coronavirus and would self-isolate at home.