‘Walking Dead’ star Alicia Witt’s parents’ cause of death has been revealed two months after their sudden demise. Death certificates issued on Wednesday and obtained by The Telegram & Gazette revealed that 87-year-old Robert Witt and 75-year-old Diane Witt may have died of “probable cardiac dysrhythmia” due to the cold. Robert also had a “history of coronary artery disease, hypertension and multiple myeloma,” the certificate revealed. 

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In December, the 46-year-old actor took to social media to announce her parents’ death. She said she hadn’t heard from them in some time and had asked a family member to check on their Massachusetts home where they were found dead. 

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“After not hearing back from my parents for several days, I reached out to a cousin who lives close to my parents to check on them. Sadly, the outcome was unimaginable. I ask for some privacy at this time to grieve and to wrap my head around this turn of events, and this surreal loss,” she wrote. 

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Their home was reportedly poorly maintained and lacked a functioning heating system for some time.

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The actor, who is also known for her role in “Orange Is the New Black,” wrote that her parents had refused her offers of help and that she hadn’t been inside their residence for over a decade. 

“Every time I offered to have something repaired for them, they refused to allow workers into their house,” she wrote.

“I begged, cried, tried to reason with them, tried to convince them to let me help them move — but every time, they became furious with me, telling me I had no right to tell them how to live their lives and that they had it all under control.”