SPRINGFIELD, Mass. — A Springfield woman has been charged with murder in connection with the death of a city man found in his apartment last month.Diomaris Valentin is scheduled to be arraigned in Springfield District Court on Thursday.The 28-year-old Valentin is charged in connection with the death of 61-year-old Craig Sheridan.Sheridan was found dead in his sixth-floor apartment on March 22, but police say it is believed he may have been dead a week before the body was discovered.