The movie. Helter Skelter first aired on April 1, 1976 as a two part movie of the week. I was mesmerized and haunted by the story and the connection to the Beatles made it even more fascinating. Afterwards we would look for more "clues" on our Beatles albums.
For me, it was a really scary movie and gave me nightmares for weeks after. My friend at the time, Jeff, after watching the movie was sure that Manson was the devil!
I've watch it again recently and it still is a great detective story and a peek into a cult life. It holds up very well.