Joely Richardson is immersing herself in her craft after the sudden death of her older sister, Natasha.
The actress, 44, said her final goodbyes to her sister Sunday. On Thursday, she was back on the London set of her latest project, a remake of The Day of the Triffids, a rep for Richardson confirms to PEOPLE.
Filming is due to wrap up next month. Joely plays the lead female role of opposite Dougray Scott in the two-part sci-fi drama based on John Wyndham’s novel.
The series also stars the Richardsons’ mother, Oscar winner Vanessa Redgrave, who had already finished filming her role before the tragedy.
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• 1992: Joely dishes on childhood with big sis Tasha
• PEOPLE pays tribute to the stars we lost too soon
• Natasha’s life & loves in pictures