Javier Guzman is a character in DEXTER. He is a hitman who goes by the alias "El Sapo" and targets Andrew Briggs after Briggs robs a jewelry store owned by Guzman's employers.
In order to get close to Briggs, Guzman poses as a fence who offers to buy the stolen jewels from Briggs, as no one else is willing to buy them, since they were stolen from an organized crime owned store that Briggs robbed. However, before Briggs can tell Guzman where the jewels are, he is murdered by Dexter Morgan. Despite this, Debra manages to find a key to a storage unit where she believes Briggs had hidden jewels, and Guzman begins following her, believing that she may lead him to the jewels. Debra eventually goes to the storage unit and finds the jewels, but Guzman shows up and disarms her and the two engage in a fight in which Guzman subdues Debra and brutally kicks her on the ground. He prepares to kill her, aiming a gun at her, but claims that he doesn't kill people unless he's paid to (being a hitman). He then leaves and takes the jewels out to his car. While his guard is down, Debra appears and shoots Guzman three times before making off with the jewels.