When his sister Jean was killed by the Sin-Eater (who was also a policeman much like Brian), the Wraith was driven mad with grief and he decided to take vengeance on the whole New York Police Department. When he arrived at a police station, he was shot by the Scourge of the Underworld who was disguised as a policeman and attempting to murder Flash Thompson.
When Jean, his sister, was killed by the Sin-Eater (who also worked as a policeman like Brian), the Wraith became overwhelmed with grief and decided to seek revenge on the New York Police Department. Upon reaching a police station, he encountered the Scourge of the Underworld, who disguised himself as a cop and aimed to kill Flash Thompson.