Mason Jones is a 34 year old homicide detective working for the state of Connecticut. He works primarily in the Greenbrook county area, and lives in Brookhaven. He was the lead investigator for the Greenbrook Slasher case, and is the lead investigator for the Fairhaven Night Prowler case. His goal is to find and put away all the wicked individuals of the world, whether behind bars or in an institution. To him, if you commit murder, you're the lowest kind of scum. He proves to be a major ally to the America Unsolved team when they begin investigating a string of unsolved cases in Brookhaven.