The Last Photograph (1970)

An ex-DEA operative must return to the mountains of South America in an effort to find his missing niece and nephew, following the brutal murders of their diplomat parents. Enlisting the help of a washed-up junkie war photographer, the only person to have seen the face of the killers, he sets out, determined to find the children and the truth, but soon learns he must also face the ghosts of his past.