Annalise Braakensiek is being honoured in messages posted to social media by friends and colleagues.
The Australian model has been found dead in her Sydney unit after concerns were raised for her welfare.
Police said a woman's body was found at a Potts Point unit on Sunday afternoon after concerns were raised for her welfare.
She has yet to be formally identified and there are no apparent suspicious circumstances, a police spokeswoman said.
Annalise Braakensiek having her photo taken with the Sydney Opera House in the background in 2004. Source: AAP
A post-mortem examination will be held to determine the cause of death.
The Sydney-based model, actress and designer was known for her roles on shows including SBS comedy series Fat Pizza, Home and Away and 20 to 1.
Braakensiek, 46, also worked closely with a number of charities, including as an ambassador for suicide prevention charity R U OK.
In November, she took to Instagram to speak about her own mental health struggles.
Australian model Annalise Braakensiek at the WWF/IMAX Australian Premiere of 'Born to Be Wild 3D' in 2011. Source: AAP
"...mental health has so so many misconceptions, criticism, misunderstandings and false judgments still!! We have to break the silence on mental health because it happens to the best of us. ( And in the worst situations)," Braakensiek posted alongside an R U OK image.
"Thank you from the bottom of my heart to all of you who have helped me though my dark clouds.... now I'm strong enough to help my loved ones who unfortunately are not in the best place right now. But we will get through this!"
Braakensiek also worked closely with the Starlight Foundation, Cancer Council and Olivia Newton-John Cancer Centre.
Annalise Braakensiek. Source: Instagram/annalisewithlove
Australian actor and fellow Pizza star Rob Shehadie took to Twitter to pay tribute to Braakensiek.
"So sad and gutted to hear about the passing of Annalise Braakensiek, she was an amazing person. I will always cherish the great memories we had on the set of Fat Pizza and on tour. God rest your soul Annalise," he tweeted.
Celebrity agent Max Markson and interior designer and stylist Alex Zabotto-Bentley also took to social media to express condolences.
Lucy Thackray said she was inspired by Annalise Braakensiek's dedication and passion in her role as a R U OK ambassador.
"A thoughtful, kind ray of light who just wanted everyone to be happy. So forthcoming about her struggles with depression to try help others. A gentle fighter, RIP," she wrote on Twitter.
Readers needing support can contact Lifeline on 13 11 14 or beyondblue on 1300 224 636.
- with AAP
