Grieving Joely Richardson Returns to Work

Grieving Joely Richardson Returns to Work
Nastasha (left) and Joely Richardson
Peter Kramer/AP; Scott Kirkland/INF

03/27/2009 AT 09:05 AM EDT

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.

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