Details in a 47-year-old murder case are being uncovered. 

The audio diaries of Margo Compton—who was killed execution-style in Oregon in 1977, alongside her twin daughters, Sylvia and Sandra, 6, and her then-boyfriend's son Gary Seslar—will be broadcast for the first time in over four decades in A&E's chilling new docuseries, The Secrets of the Hells Angels.