Peter Kramer/AP; Scott Kirkland/INF
Simon Perry
March 27, 2009 09:05 AM

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.

Richardson was given special leave from the set when news broke of her sister’s skiing accident in Canada. Two days later, Natasha’s death was announced.

2005: Joely spills on sharing screen time with mom Vanessa
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

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