The tragic rock icon was romancing the clean-cut young star when he offered her prescription pills one night when they were getting ready for bed.
Shepherd recalls, "He said, 'Here, take these,' and he had pills in his hands and I said, 'Aren't you gonna take some of them?' and he said, 'Well, I've already had mine.
"He was almost already asleep and I went and flushed them down the toilet, returned his emerald and diamond ring and just said, 'Thankyou, but I can't.'.
Presley refused to believe Shepherd had ended their romance and demanded she ditch filmmaker Peter Bogdanovich if she wanted to stay with him, during one unexpected late night visit months later.
Shepherd adds, "I don't think it had sunk in that I had already ended it.".