(CNN) -- Costa Rican Attorney General Francisco Dall'Anese Ruiz was named the new head of the International Commission Against Impunity in Guatemala, U.N. Secretary-General Ban Ki-moon announced Wednesday.
Dall'Anese will replace Carlos Castresana, who earlier this month announced his resignation because he felt Guatemala had not made enough reforms to its justice system. Castresana also said that he and his agency, known by its Spanish initials CICIG, had become the targets of disinformation campaigns.
There was nothing more he could do for Guatemala, Castresana said when he announced he was leaving.
His successor is known for his fight against drug trafficking, U.N. spokesman Farhan Haq said.
Dall'Anese is experienced in the fight against corruption and drug trafficking responsible for the high levels of insecurity in Central America, a U.N. statement said.
The United Nations established the International Commission Against Impunity in Guatemala in 2006 to investigate corruption and political violence. More than 200,000 people have been killed in the nation since 1970, mostly as a result of organized crime, drug-trade violence and a 36-year civil war that ended in 1996.
There were 6,451 slayings in Guatemala in 2009, in which 230 verdicts were achieved, Castresana said. That means, he said, that more than 96 percent of the killings last year were not solved.