Prisoners at the jail in Barinas state had accused Elvis Macuare Guerrero of "torture" and called on the authorities to act.
Related stories
Debris found from plane that went missing off US coast
Latvian Prime Minister Andris Kulbergs wins election held under shadow of Ukraine war
Rare tornado whips through small Australian town
Bosnia votes as pro-Russian politician looms large over the race and ethnic tensions simmer
Trump defiant about midterm chances as he rallies for Republicans in Ohio
Saudi-backed Yemeni army says 700 Houthis killed in 24 hours