[4][5][6] Two judicial events in 2005 did not find sufficient evidence to convict Williams of any crime, though details of the meeting introducing the Huancayoc Plan were not revealed until 2012 when second lieutenant Telmo Hurtado was questioned.

[7] According to Hurtado, who served under Williams, the colonel gave orders to "not to give written account of terrorist casualties in any military operation, but verbally" in an attempt to "avoid complaints from the relatives of the victims".

[8][9][10] According to hostages rescued from the embassy, at least one guerilla fighter was arrested and was later found to be shot in the head, raising concerns of an extrajudicial execution.

[11][12] Diario La Primera reported that Huacac would host late-night parties with mariachis for prominent Mexican drug lords at the Piura Military Casino, with all of this occurring only 100 metres (330 ft) away from the home of Williams.

[11] Attaining the rank of major-general, Williams was appointed Chief of the Joint Command of the Armed Forces of Peru, serving in the position from 2005 to 2006.

In addition, he participated in Hernando de Soto's presidential campaign as the technical team's defense and security advisor.

[16] During his tenure, Williams signed the Madrid Charter, joining an international alliance of right-wing and far-right groups organized by Spanish party Vox.