British-born actress Natasha Richardson died last week after suffering a head injury during a skiing accident. She was buried Sunday in upstate New York.
People.com said her younger sister, Joely, went back to work on the science fiction miniseries Thursday after taking a break to grieve and be with her family.
Filming on the small-screen adaptation of John Wyndham's novel, which co-stars Dougray Scott and Richardson's mother, Vanessa Redgrave, is slated to be completed next month.
Redgrave had wrapped her scenes before her daughter died, People.com said.