Zelda Williams Says She's 'Heartbroken' Over Cathriona White's Death

Zelda Williams, daughter of the late Robin Williams, took to Twitter on Tuesday to mourn the death of Jim Carrey’s girlfriend Cathriona White.

"Heartbroken to continue to watch sweet, kind souls be consumed by darkness," tweeted Williams, whose father died of a suicide in August 2014. "May it never hurt less, so we never grow numb to the loss."

WATCH: Jim Carrey and Cathriona White's Last Vacation Together -- See the Beautiful Photos

Williams also shared a link for Pieta House, a suicide prevention treatment center in Ireland. Zelda shared the link "in honor" of White, who hailed from Tipperary, Ireland.

White had favorited a message Williams shared on Twitter the day her dad died, which was a quote from the classic book The Little Prince by Antoine De Saint-Exupery.

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White, who had been in an on-and-off relationship with comedian Jim Carrey, was found dead at her home in Sherman Oaks, California on Monday night. Her death is being investigated as a suicide.

If you or someone you know needs help, please call the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).

WATCH: Jim Carrey 'Deeply Saddened' by Cathriona White's Death: 'She Was a Truly Kind and Delicate Irish Flower'