A month before Juri “Julie” Kibuishi and Samuel Herr were murdered, Rachel Buffett was planning her bachelorette party when she encouraged a former friend to take ecstasy, according to the woman, Audrey.

“Well, if I slipped it in your drink, you wouldn’t know about it,” Buffett told her, Audrey claimed.

Audrey, who also recounts the exchange in the Investigation Discovery true-crime series, “A Killer Among Friends,” said it was the last straw.

SLAIN DAD’S DAUGHTER KNEW ‘BLACK SWAN’ EX-BALLERINA SHOT HIM AFTER ONE CALL: ‘SHE KILLED HIM, DIDN’T SHE?’

“When Rachel and [her fiancé] would get mad at each other, and they were drunk, they’d yell at…

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