Corpus Christi Police Homicide Detectives are investigating a shooting that occurred in the back yard of 228 Richard Street.  Officers arrived on the scene after a neighbor called 911, at about 8:40 PM, to report hearing a shot being fired.  When they arrived they found a 44 year old man on the driveway in the backyard behind the house.  The man had a single gunshot wound to his head.  Officers did not locate a weapon, and at this time no suspects have been indentified.  The Nueces County Medical Examiner responded to the scene and took custody of the victim.  Detectives continue to investigate this crime.  If anyone has information regarding this crime, please call Detectives at 361-886-2840 or Crime Stoppers at 361-888-TIPS.