Investigation into the Murders of Marine Sergeant Ryan Downing, Alejandro Marquez, Jorge Rubio and Hector "The Hammer" Menendez is an investigation that the main NCIS Major Case Response Team conducted in April 2006 after the bodies of Marine First Sergeant Ryan Downing and gangbangers Alejandro Marquez, Jorge Rubio and Hector "The Hammer" Menendez were found in a frozen pond.