Which writer co-wrote the screenplay of Double Indemnity with Billy Wilder?

Raymond Chandler co-wrote the screenplay of Double Indemnity with Billy Wilder.

The 1944 film adapts James M. Cain’s novella, but Cain was not the film’s screenplay co-writer. Wilder and Chandler reshaped the story for Paramount while working under the restrictions of the Hollywood Production Code. Their version follows insurance salesman Walter Neff and Phyllis Dietrichson as they plot a murder for a double-indemnity insurance payout.

Chandler was already known for his detective fiction, especially The Big Sleep, but Double Indemnity was his first Hollywood screenplay. He and Wilder reportedly found the collaboration difficult, yet the finished script became one of the defining achievements of film noir.

The film starred Fred MacMurray, Barbara Stanwyck, and Edward G. Robinson. It received seven Academy Award nominations and is widely regarded as a landmark in crime cinema. James M. Cain supplied the source story; Raymond Chandler helped turn it into the screenplay.