An Attalla man will spend 20 years in prison for a robbery that happened at a home in Attalla last year. According to the Etowah County District Attorney's office, Allen C. Whitmore changed his "not guilty" plea to "guilty" just before his trial was scheduled to begin this morning. Whitmore was charged with a break-in at a woman's house last September. Prosecutors say that he assaulted the woman and then took her purse, some jewelry and a coin collection. Whitmore was sentenced immediately after entering his plea this morning. Under the terms of the plea agreement, he waived any right to appeal his conviction.