Julia Quinn, the best-selling author behind the “Bridgerton” book series that was adapted into a hit Netflix show, is mourning the death of her sister and father following a car crash. 

Quinn announced on Facebook Wednesday that her father, Steve Cotler, 77, and her sister, Ariana Cotler, 37, were killed by a drunk driver on June 29 in Utah.

“I have lost my father and my sister,” Quinn, 51, wrote. “Because a catering company did not secure their load and canvas bags spilled onto the highway. Because a pickup driver thought nothing of driving while his blood alcohol level was nearly 3 times the legal limit.”

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According to Utah Highway Patrol, Steve Cotler,