CAULDRON OF BLOOD: The Matamoros Cult Killings

When Mark Kilroy vanished while on spring break in Matamoros, Mexico, the search for the missing pre-med student led to a mass grave containing Mark's mutilated corpse along with the remains of 13 other people. The investigation uncovered how the victims were brutally killed at the hands of drug trafficker and cult leader Adolpho Constanzo. Photos.