BOSTON (AP) — A man sought almost three years in the Boston Theater District killing of a 22-year-old Army veteran has been arrested in the Dominican Republic.

The U.S. Marshals Service announced Saturday 26-year-old Peter Castillo was arrested Thursday in Santo Domingo. He was on the agency's most wanted list.

Boston prosecutors said Castillo, of Salem, is held in New York and expected to be arraigned on a first-degree murder charge in Boston next week.

Police say Perez was shot in the back around 2 a.m. April 28, 2012, after an altercation at a club.

Perez was a former Army sniper in Iraq and Afghanistan. He was attending Bunker Hill Community College and planned a law enforcement career.

A Boston grand jury indicted Castillo in June 2012. Authorities said they believed he fled to the Dominican Republic.