Jimmy Ortega Richardson, 21, of Dorchester, was identified by Boston police on Oct. 12 as the man who died after being shot at an apartment on Whitfield Street late last month. Officers responded at about 5:39 p.m. on Sept. 30 and found Richardson suffering from a gunshot wound, police said. He was taken to a local hospital, where he was later pronounced dead. Joseph Bailey, 20, also of Dorchester, has been charged with Richardson’s murder. Bailey pleaded not guilty and was held without bail, according to the report. The Boston Police Department’s Homicide Unit continues to investigate. Anyone with information can call the unit at 617-343-4470. Tips, photographs and videos may also be submitted anonymously through the department’s CrimeStoppers Tip Line.