Sal Tenor is a character portrayed by Robert Costanzo in the ABC crime series Castle. Sal was an associate of a mafia crime family, who Castle met while researching Derrick Storm in the early days of his writing career. When investigating the murder of Doctor Joshua Leeds for his role in a witness protection program, Castle decided to talk with Tenor, reasoning that the mob would already know who Leeds had performed plastic surgery on, and the search could provide them with vital information.