Seneca Richardson was found slumped over the wheel of his cab on Congress Avenue between Fourth and Fifth streets, police told WGN-TV. The incident happened around 8:45 p.m. Richardson, of the 2100 block of South 4th Avenue in the west suburb, was pronounced dead at 9:18 p.m at Loyola University Medical Center from a gunshot wound to the flank, according to the Cook County medical examiner's office.