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Like so many in Hollywood, Courteney Cox is mourning the late Alexis Arquette.

Arquette passed away Sunday after suffering an unspecified illness. Upon learningĀ of her death, Cox took to Twitter to honor the actress.

“My heart goes out to anyone who was lucky enough to know Alexis,” she wrote. “We will love and miss you forever.”

Cox was married to Alexis’ brother David Arquette for 14 years. The couple divorced in 2013; they have one daughter, Coco, 12.

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David Arquette and his sister Patricia Arquette also shared tweets Sunday in honor of their sister.

In lieu of flowers or gifts, the Arquette family has requested donations in Alexis’ honor to organizations that support the LGBTQ community.

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