In Charles Vidor 's excellent '' Love Me or Leave Me '' -LRB- MGM , 1955 -RRB- , Ms. Day again plays a torch singer , the 30 's star Ruth Etting , in a fictionalized version of the singer 's relationship with a Chicago hoodlum -LRB- James Cagney , in the last of his great , hot-wired performances -RRB- .