Police have captured the man behind the grisly slaying, mutilation, and dumping of 49 people near Monterrey last week, officials tell Reuters. Daniel Elizondo, aka "The Madman," a Zeta drug cartel leader, was caught by Mexican soldiers in Nuevo Leon. Over the last few weeks, drug cartel violence has flared, with 18 headless bodies dumped in Guadalajara amid a spate of other killings. (More Mexican drug cartel stories.)