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The alleged driver of a truck packed with migrants who died in the sweltering Texas heat this week initially tried to pass himself off as a victim

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To evade authorities and may have been under the influence of narcotics during the smuggling attempt. 

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Those are among the details to emerge Wednesday about a man authorities say is a central figure in one of the deadliest human-trafficking incidents in U.S. history.  

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With the deaths of two more migrants, the total number of fatalities climbed to 53. 

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A U.S. official and a Mexican official identified the driver as 45-year-old Homero Zamorano, a U.S. citizen 

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Who was detained Monday in a field near where the tractor-trailer was discovered in an industrial zone of San Antonio. 

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Zamorano was arrested by San Antonio police and later hospitalized for unspecified medical treatment, according to the U.S. official 

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Who said the suspect at first pretended to be a migrant and appeared to be under the influence of narcotics. 

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Zamorano had not been charged with a crime as of Wednesday afternoon. 

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He is one of three men arrested in connection to the tragedy.