From September 14, 2009 to March 8, 2010, Fontillas prowled through neighborhoods in the Pocket/Elk Grove area of Sacramento looking for homes to break into. Once he found a target, Fontillas would knock on the front door of the victim’s house to determine if anyone was home. If no one answered after a few minutes, Fontillas forced the door open and ransacked the home, taking jewelry and electronics worth thousands of dollars.
In several instances, Fontillas was confronted by homeowners as he attempted to commit or complete a burglary. He claimed that he was an employee of the Sacramento Sewer Department who was sent to their home to make sure that the sewers were working properly. Fontillas did work as a shift supervisor for the Sacramento County Regional Waste Water Treatment Plant, but had no legitimate reason to be at any of the targeted homes. During this period, Fontillas sold numerous items that he had stolen to his unsuspecting co-workers at the Waste Water Treatment Plant.