DEKALB COUNTY – (WAOK/AJC) – DeKalb police are on the lookout for at least one gunman after two men were shot and killed Monday outside Gresham Park’s pool.  The pool was closed,  so there was no one at the facility.   A witness told police he saw the shooter,   running and firing his gun,   in the parking lot,  striking the two victims.   The witness then told investigators that the suspect,   calmly walked back to the shooting scene,   while the two victims,  lay wounded.    One of the men,  was dead on the scene,   the second,    died later after being transported to a hospital.   Police have not talked about a motive in the case.