Following an international search, authorities have arrested a Salem man charged in the 2012 murder of an Army veteran from Revere.Peter Castillo, 26, of Salem, was arrested in the Dominican Republic as a fugitive from justice stemming from June 27, 2012 indictments charging him with first-degree murder and unlawful possession of a firearm, Suffolk District Attorney Daniel F. Conley’s office said in a press release Saturday.The charges stem from the 2012 shooting death of Stephen Perez Jr., of Revere, in Boston’s Theater District.Police say Perez was shot in the back around 2 a.m. April 28, 2012, after an altercation at a club.Perez graduated from Revere High School in 2007 and was a former Army sniper in Iraq and Afghanistan. At the time of his death, Perez was attending Bunker Hill Community College and planned a law enforcement career.Authorities believed Castillo had fled to the Dominican Republic, and the U.S. Marshals added Castillo to their 15 Most Wanted list late last year. The Boston Police Fugitive Unit and authorities in the Dominican Republic collaborated to locate Castillo and effect the arrest, Conley’s office said.Castillo arrived in custody on U.S. soil Saturday and is currently held in New York. He is expected to return to Boston next week to be arraigned on the charges.Two co-defendants were also indicted in connection with the shooting.Luis Sepulveda, 30, and Janice Hardy, 24, were both charged with perjury and misleading investigators for allegedly lying to Boston Police homicide detectives and a Suffolk County grand jury during the investigation of the death. Each of the co-defendants’ cases remain open and both are scheduled to return to court later this month, according to Conley’s office.