Actress Joely Richardson has spoken for the first time about her struggle to cope with the grief of losing her film and stage star sister Natasha.
She revealed she threw herself into work, going back on set the day after Richardson's funeral.
The 44-year-old also remembered how close their relationship was despite being like "chalk and cheese" and described the shock she felt at her sister's untimely death.
Natasha Richardson, 45, died in March after suffering a head injury in a skiing accident in Canada.
In an interview with Tatler magazine, her younger sister said: "We were such opposites.
"Chalk and cheese, but completely enmeshed in each other.
"I hadn't lived a day in my life without her.
"You worry about your children and your elders, but I never imagined such a thing as this.
"Tash was a given to me."
The two sisters - the children of actress Vanessa Redgrave and the late director Tony Richardson - were particularly close, Joely said.
"So much of what I am is who Tasha was, and I think, sharing all those formative years, there is a level of merging," she said. "I still think of my father daily.
"And I cannot imagine that there will ever be a day when I don't think of Tasha."
In the interview, the actress also revealed she is going to New York with her 17-year-old daughter Daisy for two months to be closer to Natasha's sons, Micheal, 14, and Daniel, 13.
Natasha Richardson fell and hit her head during a skiing lesson on the nursery slope at the Mount Tremblant resort in Quebec during a holiday with her children and sustained a serious head injury.
Ballymena actor husband Liam Neeson flew her to hospital near their home in New York, where she died on March 18.
The full interview will appear in the January issue of Tatler, which goes on sale on Thursday.
© Press Association