Editor of the New York Express who hides his past as George Grant. After killing his estranged wife Charlotte during a confrontation over her threat to expose his identity, he stages the scene as an accident. He later murders Charlie Barnes to protect his secret. Identified by Judge Hacker, he refuses to shoot Steve McCleary and commits suicide by cop.
Hacker's recognition destroys Chapman's ability to conceal his past.
Hacker identifies Chapman as the groom who married Charlotte, confirming Chapman's hidden identity and guilt.
Barnes's discovery makes him a direct threat to Chapman's secret.
Chapman overhears Barnes attempting to reveal the wedding evidence and intercepts and kills him.
They represent opposing attitudes toward the newspaper's editorial direction.
Chapman edits the New York Express, where Allison is a successful feature writer frustrated by the paper's sensationalism.
Chapman initially mentors McCleary, who later investigates Chapman's crimes.
Steve McCleary is described as Chapman's ace reporter and protégé at the New York Express.
Their unresolved marriage becomes the source of Chapman's exposure and first murder.
Charlotte Grant is identified as Mark Chapman's estranged wife and confronts him about their abandoned marriage.
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