Which singer did young Bruce Willis manage to work in the frame, playing his debut role?

The First Deadly Sin is a 1980 American crime thriller film produced by and starring Frank Sinatra. The film features Faye Dunaway, David Dukes, Brenda Vaccaro, James Whitmore, and Martin Gabel in his final role. The film is based on the 1973 novel of the same name written by Lawrence Sanders. The screenplay was written by Mann Rubin.

The film originally was slated to be directed by Roman Polanski, who was dropped by Columbia Pictures after statutory rape charges were brought against him. Director Brian G. Hutton took over the production after Polanski fled to France.

The last of nine films produced by Sinatra, and his final starring role, he plays NYPD Sergeant Edward X. Delaney, a troubled veteran New York City Police Department homicide detective. In a supporting role, Dunaway is Delaney's ailing wife, hospitalized during the entire story with a rare kidney affliction. Bruce Willis makes his film debut as an extra walking past Sinatra in a restaurant (although he is virtually unrecognizable due to a hat that covers his eyes).