Perez is believed to have been responsible for ordering the execution of Helen's brother, Commander Frank McGuire and he also abducted his daughter, Emma for safekeeping. Perez was later arrested in a standoff between himself, his men and NCIS Agent G. Callen although Perez knew from the very beginning that Callen was an NCIS Agent, having called his ex-wife, Helen for information in regards to their supposedly missing daughter.