Juan Manuel Marquez-Rodriguez was supposed to use a baggie of marijuana to lure Julio Adrian Serrano out of his home on Gallagher Avenue that cool December morning in 2006, as two other men lay in wait to kidnap him at gunpoint.But when Serrano went out to meet Marquez, he spotted Sergio "Pelon" Oslan Rivera jumping over a nearby fence. Serrano immediately turned around and ran back into his trailer. Marquez, 27, pulled out a .40 caliber pistol and fired at Serrano, then 19. One bullet hit Serrano in the back, killing him on the spot, according to information Laredo police...