Stanley Grex was a rich businessman who began providing income for the Pickman Project, when they got their funding cut by the goverment. When Leo Kasper declares war against the project, he convinces Danny Lamb to assassinate him. They access an office high up the Project Office Skyscraper and Danny shoots Grex in the head with a Sniper Rifle. Shortly after, the Project Militia arrive and check the body before shutting down the exits.
- On the Wii version, at the beginning of Assassination, Leo will say "They wanted a perfect assassin? Well they got one, right between the eyes".
- Grex is possibly the owner of Maibatsu Corporation.