The writer and son of Oscar-winning blacklisted Hollywood screenwriter Dalton Trumbo has died aged 70.

Christopher Trumbo, who wrote scripts for Ironside, Quincy, M.E. and Falcon Crest, died at his home in Ojai.

His sister, Mitzi Trumbo, told the Los Angeles Times he died from complications of kidney cancer.

Christopher Trumbo was an expert on the 1940s House Un-American Activities Committee investigation into alleged communist infiltration of Hollywood. He wrote the play, Trumbo: Red, White & Blacklisted, based on his father’s letters.

Dalton Trumbo refused to cooperate with the committee and was imprisoned as a member of the blacklisted Hollywood 10.

Dalton wrote The Brave One in 1957 under the name Robert Rich. It won an Oscar.