Actress Briony McRoberts has died after being hit by a Tube train near her home, her agent said today.
McRoberts, who was married to Downton Abbey actor David Robb, appeared in Scottish drama Take The High Road for nine years and also starred in Taggart and EastEnders.
Her body was found at Fulham Broadway station just after 8.30am on Wednesday.
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Agent Katie Threlfall said the "well-loved" and "vibrant" actress had taken her own life, describing the death as "unbelievably shocking".
She said: "It's just a terrible, terrible loss of a wonderful woman. Nobody had any idea it was going to happen. Her husband is deeply shocked.
"She was a wonderful woman who had troubles and she will be very much missed. She was so well-loved and was the most vibrant character you could hope to meet. It is just a tragedy."
Fellow actors have paid tribute to McRoberts, 56, whose television career included appearances in The Bill and Heartbeat.
Andy Cameron wrote on Twitter: "Sad sad news about the death of Briony McRoberts. I shared a thousand laughs with her on High Road. My thoughts are with David. RIP Briony."
Gary Hollywood, who also appeared in the long-running soap, wrote on the site: "'Numb' RIP to my 'lady Laird' Briony McRoberts xxx."
British Transport Police said a file had been prepared for the coroner.
Robb, who plays Dr Clarkson in Downton Abbey, has been a volunteer for The Samaritans in London for 25 years.