Martin Stett becomes Freeburg's Deputy Chief following the departure of Francis Kendrick early in the game. As Deputy, he supports Jack Boyd by providing police services.
During the game, Stett offers the options of sending recruits to the Police Academy for improvement, organising a BBQ for members of staff, hiring a snitch, getting names of policemen testifying against you, and convincing officers not to testify against you.
After Jack's second convalescence, Stett goes missing and you lose access to his options for the final third of the game. After you successfully storm City Hall or Caffre's estate, it is revealed that Stett is found murdered.