Appeals courts upheld his conviction and death sentence. Griffin was executed by lethal injection on June 21, 1995. Griffin maintained his innocence right up to his execution.[8][9]
Re-opened investigation
After Griffin's execution, a 2005 post-execution investigation was sponsored by the NAACP Legal Defense and Educational Fund.[10][11][12] This NAACP investigation raised doubts about the conviction (specifically as to the shooter's identity), and subsequently caused an investigation by the St. Louis City Circuit Attorney's Office. The St. Louis City investigation ended in a finding that "the right person was convicted".[13]