Drug Enforcement Administration and Texas Department of Public Safety agents arrested the son of the owner of a Mexican ranch where human sacrifice was performed by a drug-smuggling cult. Serafin Hernandez Rivera Sr. of Brownsville, Tex., was one of three men charged in federal warrants with marijuana importation, possession and conspiracy. The other two, Martin Quintana and Mario Fabio, both Mexicans, are believed to have taken part in the slaying of University of Texas student Mark Kilroy, U.S. Customs agent Oran Neck Jr. said. Hernandez’s father, Brigido Hernandez, owns Rancho Santa Elena near Matamoros, Mexico, where the sacrifices allegedly took place. Brigido Hernandez has not been charged. Officials reportedly received word that Adolfo de Jesus Constanzo, 26, and Sara Maria Aldrete, 24, suspected cult ringleaders, had gone to Mexico City.