Cattrall, 66, shared a heartfelt post on Instagram which included several photos of her and her mother, Shane Cattrall, over the years.
She captioned the post: “Shane Cattrall 1929 – 2022. Rest in peace Mum.”
The photos included selfies of Shane and Kim together, and a sweet photo of the pair together on Kim’s graduation day.
There were also some older black-and-white photos of Shane, and a sweet one of a school-aged Kim with her mum.
Plenty of friends and fans have shared their condolences, including British talk show host Alan Carr.
“Sorry darling. Sending you lots of love,” he wrote.
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Kim, who appears on the TV show Queer As Folk, also saw her show co-stars send their love.
Co-star Stephen Dunn wrote, “Sending all my love,” while John Sibilly wrote, “Huge hugs and all the love.”
So far Kim’s Sex and the City castmates Kristin Davis, Cynthia Nixon and Sarah Jessica Parker are yet to comment.
It’s unlikely Parker will comment given she and Kim’s falling out over the years, and how Cattrall reacted the last time Parker tried to reach out to her after a family tragedy.
In 2018, when Kim’s brother Chris was found dead after going missing, Parker reached out privately to her, but Kim wasn’t so grateful for her support.
The actress took to social media to share a damning response to Parker: “I don’t need your love or support at this tragic time @sarahjessicaparker,” she wrote.
It was followed by an even more fiery caption, which even referenced her late mum
“My Mom asked me today ‘When will that @sarahjessicaparker, that hypocrite, leave you alone?’,” Kim wrote in the caption. “Your continuous reaching out is a painful reminder of how cruel you really were then and now.
“Let me make this VERY clear. (If I haven’t already) You are not my family. You are not my friend. So I’m writing to tell you one last time to stop exploiting our tragedy in order to restore your ‘nice girl’ persona.”
Parker never responded to the post, later telling Harper’s Bazaar, “So there was no fight; it was completely fabricated because I actually never responded. And I won’t, because she needed to say what she needed to say, and that is her privilege.”