Kevin Spacey took to Twitter on Tuesday to mourn the loss of his House of Cards co-star.

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"RIP Elizabeth Norment. We all loved her and she leaves a void in all of us here at HoC's," he tweeted.

Norment, who played the secretary of Spacey's character Frank Underwood, died on Oct. 13 at the Memorial Sloan Kettering Cancer Center in New York, her sister told The Hollywood Reporter. She was 61.

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"Who will keep Frank Underwood straight now? She was perfect in that role! Very sad," wrote one fan on the House of Cards official Facebook page.

"Frank will run amuck without her. She was a fine actress in a great role," wrote another.

The House of Cards showrunner also spoke about the actress after her death and praised her for her work and good nature.

"Everyone at House of Cards is deeply saddened by Elizabeth's passing," Beau Willimon said in a statement. "She was a talented actress, a warm soul and a good friend to us all."

Norment was born in Washington, D.C. in 1952 and earned her master's degree from the Yale School of Drama in 1979. She also appeared on Law & Order as Judge Arlene Brewer from 2002 to 2008. The actress is survived by her mother, two more sisters, her brother and six nieces and nephews.

Watch the trailer for season two of House of Cards below:

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