The 88 year old passed away on Wednesday (18Nov15) at the West Hills Medical Center in California.

Born in Indiana, Prideaux initially eyed a career as an actor, but discovered his love for writing after moving to New York. He had short stories published in Ladies Home Journal and Playboy before joining the Barr-Wilder-Albee Playwrights Unit. His first play, Postcards, was a big hit and eventually transferred to Broadway in 1970.

He later moved into screenwriting, penning scripts for soap opera The Secret Storm and Elizabeth Taylor's 1978 TV movie Return Engagement, and he also worked with Katharine Hepburn on the TV films Mrs. Delafield Wants to Marry, Laura Lansing Slept Here, and The Man Upstairs.

His other plays included The Last of Mrs. Lincoln, for which Julie Harris won a Tony Award in 1973. The actress reprised her role for a TV movie adaptation in 1976. She reunited with Prideaux in 1980 to star in Broadway's Mixed Couples with Geraldine Page.