FLINT -- Flint police are investigating a double shooting that killed one person early Sunday morning.  Police tell NBC25 it happened around 3:30 a.m. at 1721 Neilson Street.  One man was pronounced dead upon arrival at the hospital.  A second victim, a woman, remains in critical condition.  Police describe the suspects as two black men driving a Ford Crown Victoria with a loud exhaust.  Anyone with information is asked to call Flint Police or Crime Stoppers.