FORMER Dynasty star Kate O'Mara has died at the age of 74.
The actress was best-known for playing Alexis Colby's scheming sister Cassandra Morrell in the US soap in the mid-1980s, along with roles in Doctor Who, Howards' Way and Triangle.
Joan Collins, who played Alexis in Dynasty, paid tribute to O'Mara on Twitter yesterday.
She wrote: "Tragic news about Kate O'Mara. We had great fun on Dynasty when she played my sister who Alexis insisted on calling CASSIE! RIP."
O'Mara's agent Phil Belfield said she died in a nursing home after a short illness.
He added: "She had so much energy and vitality. A shining star has gone out and Kate will be missed by all who knew and worked with her."
O'Mara's first television roles were in the 1960s, but it was in the 1980s that she landed her biggest and longest-running jobs.
As well as Dynasty she starred as a ruthless businesswoman in BBC drama Howards' Way.
She also appeared in the original run of Doctor Who opposite both Colin Baker and Sylvester McCoy as renegade Time Lord The Rani.
Last year, which was Doctor Who's 50th anniversary, she said she would like to reprise the role.
She told the Huffington Post: "I'd love to come back. To have a much older woman as your adversary, there's something interesting about that."
In the 1990s she starred in the comedy show Absolutely Fabulous as Jackie, the sister of Joanna Lumley's character Patsy.
More recently she had appeared in ITV soap Benidorm and a stage adaptation of Agatha Christie's Death On The Nile.
She is survived by her sister, the actress Belinda Carroll.