Dynasty actress Kate O’Mara died on Sunday at a southern England nursing home. She was 74.

Kate O'Mara Dies

Mara passed away following a brief illness, according to her agent, Phil Belfield, reported Variety.

After falling ill earlier this month, O’Mara had tweeted a thank you message to her followers that were concerned over her health.

Hello all – thank you so much for your kind tweets. It's both humbling and completely overwhelming to read all of your messages. Much Love x

— Kate O'Mara (@KateOmara_) March 17, 2014

During the 80s, O’Mara, in one of her best-known roles, starred in Dynasty as Cassandra “Caress” Morell. Caress was the sister of Joan Collins’ character Alexis Colby. The popular show, which won five Golden Globes during its nine seasons, also starred John Forsythe, Linda Evans and Gordon Thomson.

Upon learning of O’Mara’s death, Collin’s took to Twitter to express her sorrow at her late costar’s passing.

Tragic news about Kate O Mara , we had great fun on Dynasty when she played my sister Caress who Alexis insisted on calling CASSIE ! RIP

— Joan Collins (@joancollinsobe) March 30, 2014

Following her stint on Dynasty, O’Mara appeared in Doctor Who as The Rani alongside Sylvester McCoy and Colin Baker’s Timelords, and in Howard’s Way as Laura Wilde. Baker, who reunited with O’Mara during events celebrating Doctor Who’s 50th anniversary, shared his grief over the news on Twitter.

Oh my goodness. Kate O'Mara is no longer with us. Sad sad news. A delightful, committed and talented lady and actress. We are the poorer

— Colin Baker (@SawbonesHex) March 30, 2014

Though primarily known for her TV work, O’Mara also acted in a number of films, including The Vampire Lovers, The Horror of Frankenstein, The Tamarind Seed, Whose Child Am I, and most recently, The Road to Ithaca.

O’Mara is survived by her sister, actress Belina Carroll.

– Chelsea Regan