Cristo te ama (1975)

A young woman is fired by her lover from her job in a bookstore and meets a trafficker she falls in love with. She becomes a heroin and prostitutes to buy the drug. The trafficker is arrested and she surrenders to the supplier in exchange for drugs. He pretends to care for a cemetery and demands money from him. She desperately kills him. When the trafficker leaves, he decides to rebuild his life and goes as a doctor to the mountains with the young woman. She also wants to quit the drug and succeeds with her help, but when boarding a vehicle they are killed by four gunmen. Source: http://www.imcine.gob.mx/cine-mexicano/pelicula2425