Lucia Chena was a Sandinista freedom fighter from Nicaragua. She came to the United States posing as a Costa Rican graduate student in political science.
She befriended Carl, an aide to a congressman on the Intelligence Committee overseeing Central America.
She called Elizabeth after she smoked cocaine with him and needed help. ("Cardinal"). She later used Carl to let Elizabeth into the congressman's office, after which she was given orders to kill him. She did so by poisoning heroin he injected into himself. ("Behind the Red Door")