The police operation
On January 3, 2008, police were deployed at the Santa Margarita estate near Vilcún amid a land occupation involving Mapuche activists. During the operation, Matías Catrileo was struck by a shot fired from a police weapon and died.
The later criminal proceedings established that Carabineros officer Walter Ramírez fired the shot. Reporting on the judgments states that Catrileo was hit in the back and that the use of force was found unjustified or disproportionate in the circumstances.
Military-court proceedings
The case was tried within Chile's military-justice system. In January 2010, the Military Tribunal of Valdivia sentenced Ramírez to two years of a non-custodial sentence for unnecessary violence resulting in death. The victim's family appealed, arguing that the penalty was inadequate.
In August 2010, the Martial Court increased the punishment to three years and one day, while still granting supervised release rather than effective imprisonment.
Supreme Court confirmation
On December 15, 2011, the Second Criminal Chamber of Chile's Supreme Court unanimously rejected cassation challenges and left the three-year-and-one-day sentence in place. Ramírez therefore did not serve the sentence in prison; the judgment was carried out under supervised-release conditions.
This distinction is important. The absence of effective imprisonment did not mean that Ramírez was acquitted. A conviction remained in force, but the sanction was served through a non-custodial benefit available under the judgment.
State responsibility
Catrileo's family also pursued civil responsibility. Chilean courts later ordered the state to compensate his mother and sister for moral damages. In 2015, appellate and Supreme Court decisions upheld compensation totaling 130 million Chilean pesos.
The civil rulings treated the officer's conduct as conduct attributable to the state. They are separate from the criminal conviction and should not be confused with a second criminal prosecution.
Timeline
January 3, 2008: Matías Catrileo is fatally shot during a Carabineros operation near Vilcún.
January 2010: a military tribunal sentences Walter Ramírez to two years for unnecessary violence resulting in death.
August 19, 2010: the Martial Court increases the sentence to three years and one day under supervised release.
December 15, 2011: the Supreme Court unanimously confirms the conviction and sentence.
2015: civil courts uphold compensation for Catrileo's mother and sister based on state responsibility.
Current status
The case is solved / adjudicated for purposes of this archive because an identified officer was convicted and the conviction was affirmed by Chile's Supreme Court. The case remains historically and politically contested in discussions of policing, military jurisdiction and Mapuche rights, but those broader debates do not erase the standing judicial outcome.