Cass County Sheriff'S Department

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This undated photo provided by the Cass County Sheriff's Department in Fargo, N.D., shows Charles Carlton, of Katy, Texas. At a hearing in Fargo on Monday, March 10, 2014, Carlton pleaded guilty to three counts, including conspiracy to distribute controlled substances resulting in serious bodily injury and death. He is accused of distributing chemicals that ultimately resulted in the synthetic drug deaths in June 2012 of two teens in the Grand Forks, N.D. He faces life in prison. Sentencing is scheduled for May 27. (AP Photo/Courtesy of the Cass County Sheriff's Department)