It was a steep fall for the now-86-year-old former strongman who ruled Guatemala from March 1982 to August 1983, during the height of a brutal civil war that killed 200,000 people, mainly Indians.
A tribunal on Friday ruled that Rios Montt knew about the slaughter of at least 1,771 Ixil Maya in Guatemala's western highlands and didn't stop it, handing down the first genocide conviction ever given to a Latin American strongman in his own country.
"He is not comfortable, but as a good soldier he is used to this," said Rios Montt's lawyer, Francisco Palomo, who is expected to seek to have the ex-general transferred to a hospital or to have his sentence be served under house arrest.
Matamoros prison, where Rios Montt is now behind bars, is located on a military base in Guatemala City where the former general spent time as a young cadet. It was built to house high-profile inmates who could be unsafe in normal prisons.
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Authorities there say he has the right to spend two hours outside his cell each day, but guarded by officers. He has the right to three daily meals, though family members can also bring him food.
"It's very valuable to us, totally refreshing. We deserved it," said human rights activist Helen Mack.
The long sentence was a message, activists said, that the previously untouchable and brutal military structures need to be held accountable. Guatemala's maximum sentence is 50 years making the 80 years symbolic.
The three-judge panel also ordered prosecutors to continue investigating to bring all those responsible for abuses to justice. Until now, only low or middle-level officials have been prosecuted for war atrocities.