Superman star Valerie Perrine died after suffering sudden cardiac arrest.

The 82-year-old actress - who played Eve Teschmancher, the personal assistant and love interest of Lex Luthor, in the superhero films - passed away at her home in Beverly Hills, California last month and now it's been revealed her cause of death was listed as acute cardiopulmonary arrest with Parkinson's disease being listed as an underlying cause.

According to the death certificate, obtained by PEOPLE.com, dementia was also listed as a contributing factor.

After her death, Valerie's longtime partner, Stacey Souther, praised the actress for living her life "to the fullest" despite being diagnosed with Parkinson's disease in 2015.

Stacey told The Hollywood Reporter: "She faced Parkinson's disease with incredible courage and compassion, never once complaining. "She was a true inspiration who lived life to the fullest - and what a magnificent life it was. The world feels less beautiful without her in it."

Stacey cared for Valerie as the disease progressed - which eventually took away her mobility, as well as the actress' ability to eat and talk.

A GoFundMe crowdfunder was set up to cover Valerie's medical costs, but later donations went towards giving her a proper "the farewell" and honouring her wish of being buried at Forest Lawn Memorial Park in the Hollywood Hills.

The page's description included a message from Valerie's brother Ken - who is also fighting a battle with Parkinson's.

He wrote: "I am devastated by the loss of my amazing sister Valerie this morning. She lived an extraordinary life most us can only dream of.

"She will be missed by everyone that knew her, and especially her loving fans. She fought till the end and never gave up.

"Thank you all for the kind support over the years. I appreciate all the love you have given her. Please donate and share so we can make her final wish come true. (sic)"

Stacey immortalised her partner in 2022 documentary Valerie and she told Parkinson's Life magazine that she wanted to make sure the actress was not forgotten.

She said: "Valerie inspired me. She was a showgirl in Vegas during its golden era and a movie star in 1970s Hollywood during the last decade of glitz, glamour and excess.

"This film is a love letter to her. I didn't want her to be forgotten. I wanted her life and legacy to be celebrated and shared with the world."