Oppenheimer's 2014 companion piece — an Indonesian optometrist confronts the men who killed his brother. Less spectacular than its sibling but more devastating.
From Wikipedia
The Look of Silence is a 2014 internationally co-produced documentary film directed by Joshua Oppenheimer about the Indonesian mass killings of 1965–66. The film is a companion piece to his 2012 documentary The Act of Killing. Executive producers were Werner Herzog, Errol Morris, and Andre Singer. It was nominated for the Academy Award for Best Documentary Feature at the 88th Academy Awards.