SAN JUAN, Puerto Rico (AP) — A former Puerto Rico police sergeant has been sentenced to almost four years in prison in a case involving a man who was fatally beat by officers.

The U.S. Justice Department said Friday that Antonio Rodriguez Caraballo pleaded guilty to making false statements to a grand jury about what he observed during the 2008 beating. Four other officers have pleaded guilty in the case and a fifth has already been sentenced.

Authorities said 19-year-old Jose Luis Irizarry was restrained and hit with police batons while celebrating the outcome of elections held in November 2008.

Puerto Rico's police department is undergoing a 10-year federally mandated reform after U.S. prosecutors issued a 2011 report accusing officers of illegal killings, corruption and civil rights violations.