Peltier's conviction stemmed from a 1975 shooting in South Dakota in which FBI agents Jack Coler and Ron Williams were killed - around the same time Anna Mae was murdered.
Fifty years on, Anna's daughter Denise Maloney told The Sun how her mum sat her down and asked her to "look after" her sister just weeks before she was murdered.
It took a week to identify the body as belonging to 30-year-old Anna Mae Pictou Aquash - a key player in the American Indian Movement (AIM), set up to challenge police brutality and the oppression of Indigenous rights.
She alleges that Leonard Peltier - who was serving two life sentences on two counts of first-degree murder before he was commuted - was complicit.
Anna Mae Aquash was executed in the woods after being accused of being an FBI informant - and those complicit in her murder didn't come forward for three decades.
