Tom Hanks, Jay Leno, Holly Robinson Peete, Loretta Devine and Stevie Wonder were among those who helped celebrate the life of Michael Clarke Duncan during a nearly four-hour memorial service marked by heartfelt speeches, rousing gospel performances and photos of the always-smiling actor. Hanks and Leno shared stories about “The Green Mile” star at Monday’s service. Peete talked about meeting Duncan while he was still a celebrity bodyguard. Devine spoke of how the actor would do anything for a laugh. Wonder appeared via video, solemnly playing piano and singing the opening verses of his life-affirming song “As” for the man he called “a gentle giant.” Duncan died Sept. 3 at 54, having never fully recovered from a heart attack in July. His physician, who revealed Duncan used a pacemaker, was among the speakers at the service at Forest Lawn Memorial Parks and Mortuaries in Los Angeles.