The diary of murder victim Margo Compton is shared in the Hells Angels documentary series

Details about the 47-year-old murder case are being discovered.

Audio diary of Margo Compton—who was killed execution-style in Oregon in 1977, along with her twin daughters, Sylvia And Sandra6 years old and her boyfriend's son at the time Gary Seslar—will air for the first time in more than four decades in A&E's compelling new docu-series, Secrets of the Hells Angels.

“This is really difficult,” Compton said in the diary clip shared on E! Exclusive news sneaky from the eight-part series. “There are many things I want to tell, about a girl who got married at a very young age and wanted to end that marriage for some good reasons.”

Compton – just 24 years old at the time of her death – later reflected on her tumultuous marriage to the wannabe Hells Angel Doug Comptona key character in Sergeant Detective Mark Graham18 year journey to find who is responsible for the murders.

“That night, he beat me so badly,” she recalled in another clip in her audio diary, “my back still aches from that beating.”