Rios Montt went on trial in March on charges of ordering the massacre of Maya Indians in the 1980s as part of a scorched earth policy in the most brutal chapter of a 36-year civil war that ended in 1996.
He was convicted on May 10 of genocide and war crimes in a historic ruling and got an 80-year sentence. However, yesterday, the Constitutional Court struck down the conviction and the sentence.
Although the conviction was overturned, most of the trial and testimony was left intact. Now, the trial goes back to the point at which it stood on April 19. The judges in the new phase will be the same as in the original trial. No date for the new phase was set.
The Constitutional Court upheld defense lawyers' claim of a procedural error.
It said this error occurred when the court that ultimately convicted the former dictator went ahead with the trial on April 30 without considering a motion filed by the defense with an appeals court.