CHANDLER, Ariz. — Authorities have determined a man who was stabbed and beheaded in a suburban Phoenix apartment was killed for stealing drugs from a Mexican cartel, in a gruesome example of drug cartel violence spilling over the border. The cartel found out Cota-Monroy had actually stolen the drugs and hired men to kidnap and kill him in Nogales, Mexico. But Cota-Monroy was able to talk his way out of being killed, saying he'd pay back the money and use his house for collateral, the report says. But the house wasn't Cota-Monroy's and he fled to the Phoenix area, leading...