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 was also a policeman like Brian), the Wraith became consumed with grief and vowed to seek revenge on the entire New York Police Department. Upon arriving at a police station, he was shot by the Scourge of the Underworld, who disguised himself as a cop and attempted to kill Flash Thompson.