Helen McCrory passed away last week after a battle with cancer. Her husband Damian Lewis revealed the sad news over the weekend.
Her co-stars on the fantasy series, Tom Felton and Jason Isaacs, recently paid tribute to the late actress.
While Felton played Draco Malfoy, Narcissa's son, in the series, Isaacs played Lucius, her husband.
"Decades ago Helen and I auditioned together for a film," Isaacs wrote in his Twitter post on Saturday. "I came home and said to Emma [Hewitt, his wife], 'I think I've just met the greatest actress I've ever seen.'
"After years of watching her mesmerize audiences I don't think that anymore… I know it.
He continued: "Luckily, I eventually found out that she was also scabrously funny, shockingly naughty and with an empathetic heart the size of a planet.
"As continually starstruck as I was on the Harry Potter films, being screen-married to and giggle with the great Helen McCrory will always be a highlight."
He shared his statement with the caption: "Hold those you love and tell them every day. It’s all we have."
Felton, who played Draco Malfoy in all eight 'Harry Potter' movies, also posted a heartfelt tribute via Instagram.
He wrote: "So sad to say farewell so suddenly - I never took the chance to tell her , but she helped shape me as a person so much - on & off screen.
"She was always relentlessly herself- razor sharp wit - silver tongued - kind & warm hearted - she suffered no fools yet had time for everyone - thank you for lighting the way forward & holding my hand when I needed it xx"
McCrory's husband Damian Lewis penned a tribute to his late wife which was published by the Sunday Times.
In it , he wrote: "Helen was an even more brilliant person than she was an actress.
"She was a people person, sure. 'I'm much more interested in who I'm with than where I am,' she would say, and innately wanted to share. But she also lived by the principle of kindness and generosity. That you put these things out into the world to make it better, to make people feel better."
He also wrote in the tribute: "Her ability to be in the present and enjoy the moment was inspirational. Nor was she interested in navel-gazing. No real interest in self- reflection; she believed in looking out, not in. Which is why she was able to turn her light so brightly on others."
He described her as "a meteor in our life."